diff --git a/schematics/c3lingo_unit-assembly/c3lingo_unit-assembly.kicad_sch b/schematics/c3lingo_unit-assembly/c3lingo_unit-assembly.kicad_sch
index 9eb4a4f..bdda17a 100644
--- a/schematics/c3lingo_unit-assembly/c3lingo_unit-assembly.kicad_sch
+++ b/schematics/c3lingo_unit-assembly/c3lingo_unit-assembly.kicad_sch
@@ -6,10 +6,10 @@
 	(paper "A4")
 	(title_block
 		(title "c3lingo interpeter unit")
-		(date "2024-11-16")
-		(rev "v0.3.4")
+		(date "2024-12-18")
+		(rev "v0.4.0-dev")
 		(company "Jannik Beyerstedt (jtbx)")
-		(comment 1 "Prototype 2 + Rework")
+		(comment 1 "Prototype 3")
 	)
 	(lib_symbols
 		(symbol "power:+15V"
diff --git a/schematics/c3lingo_unit-assembly/c3lingo_unit-channel_io/c3lingo_unit-channel_io.kicad_sch b/schematics/c3lingo_unit-assembly/c3lingo_unit-channel_io/c3lingo_unit-channel_io.kicad_sch
index a1dacb2..f120893 100644
--- a/schematics/c3lingo_unit-assembly/c3lingo_unit-channel_io/c3lingo_unit-channel_io.kicad_sch
+++ b/schematics/c3lingo_unit-assembly/c3lingo_unit-channel_io/c3lingo_unit-channel_io.kicad_sch
@@ -6,10 +6,10 @@
 	(paper "A4")
 	(title_block
 		(title "c3lingo interpeter unit -- channel I/O")
-		(date "2024-11-16")
-		(rev "v0.3.4")
+		(date "2024-12-18")
+		(rev "v0.4.0-dev")
 		(company "Jannik Beyerstedt (jtbx)")
-		(comment 1 "Prototype 2 + Rework")
+		(comment 1 "Prototype 3")
 	)
 	(lib_symbols
 		(symbol "Amplifier_Operational:NE5534"
@@ -5026,7 +5026,7 @@
 		)
 		(uuid "ff4474e5-e6df-4454-a050-d2c8da3e9344")
 	)
-	(text "Mic Preamp\nGain: 35 dB\nLP-Filter: 10 kHz"
+	(text "Mic Preamp\nGain: 30 dB\nLP-Filter: 10 kHz"
 		(exclude_from_sim no)
 		(at 71.12 107.442 0)
 		(effects
@@ -5039,17 +5039,6 @@
 		)
 		(uuid "0283aacb-a6d1-48d6-8176-2092ca9d3c2d")
 	)
-	(text "PCB v0.3.3 Errata:\nAdd 220pF on parallel to R602"
-		(exclude_from_sim no)
-		(at 177.038 160.02 0)
-		(effects
-			(font
-				(size 1.27 1.27)
-			)
-			(justify left)
-		)
-		(uuid "3093f7a4-c29f-4ab8-ae0c-d368da4b6ee5")
-	)
 	(text "Headphone driver\nGain: 3.9"
 		(exclude_from_sim no)
 		(at 184.15 111.76 0)
@@ -5691,7 +5680,7 @@
 				)
 			)
 		)
-		(property "Value" "68K 1%"
+		(property "Value" "39K 1%"
 			(at 106.68 85.9536 90)
 			(effects
 				(font
@@ -5735,7 +5724,7 @@
 				(hide yes)
 			)
 		)
-		(property "LCSC Part #" "C17801"
+		(property "LCSC Part #" "TODO"
 			(at 106.68 88.9 0)
 			(effects
 				(font
@@ -6150,7 +6139,7 @@
 				)
 			)
 		)
-		(property "Value" "68K 1%"
+		(property "Value" "39K 1%"
 			(at 106.68 68.6604 90)
 			(effects
 				(font
@@ -6194,7 +6183,7 @@
 				(hide yes)
 			)
 		)
-		(property "LCSC Part #" "C17801"
+		(property "LCSC Part #" "TODO"
 			(at 106.68 63.5 0)
 			(effects
 				(font
diff --git a/schematics/c3lingo_unit-assembly/c3lingo_unit-channel_mixer/c3lingo_unit-channel_mixer.kicad_sch b/schematics/c3lingo_unit-assembly/c3lingo_unit-channel_mixer/c3lingo_unit-channel_mixer.kicad_sch
index 0981421..263113b 100644
--- a/schematics/c3lingo_unit-assembly/c3lingo_unit-channel_mixer/c3lingo_unit-channel_mixer.kicad_sch
+++ b/schematics/c3lingo_unit-assembly/c3lingo_unit-channel_mixer/c3lingo_unit-channel_mixer.kicad_sch
@@ -6,10 +6,10 @@
 	(paper "A3")
 	(title_block
 		(title "c3lingo interpeter unit -- channel mixer")
-		(date "2024-11-16")
-		(rev "v0.3.4")
+		(date "2024-12-18")
+		(rev "v0.4.0-dev")
 		(company "Jannik Beyerstedt (jtbx)")
-		(comment 1 "Prototype 2 + Rework")
+		(comment 1 "Prototype 3")
 	)
 	(lib_symbols
 		(symbol "Amplifier_Operational:LM358"
@@ -6861,7 +6861,7 @@
 		)
 		(uuid "0cde588a-546a-4466-b0e6-ce650deebd57")
 	)
-	(text "-19 dBu"
+	(text "-18 dBu"
 		(exclude_from_sim no)
 		(at 227.33 162.56 90)
 		(effects
@@ -6872,7 +6872,7 @@
 		)
 		(uuid "21dc4f4c-b380-4cb6-9ed6-408279643f23")
 	)
-	(text "-22 dBu"
+	(text "-21 dBu"
 		(exclude_from_sim no)
 		(at 210.82 162.56 90)
 		(effects
@@ -6894,7 +6894,7 @@
 		)
 		(uuid "3a32b02a-5d29-4689-8a3c-7d2e02105d46")
 	)
-	(text "Adjustable Input Gain\nGain: 0 to 45 dB"
+	(text "Adjustable Input Gain\nGain: 0 to 30 dB (+30dB from pre-amp)"
 		(exclude_from_sim no)
 		(at 157.988 96.774 0)
 		(effects
@@ -6907,7 +6907,7 @@
 		)
 		(uuid "3ed91943-91af-4f11-b5c0-3f35f0e07e9b")
 	)
-	(text "-2 dBu"
+	(text "-3 dBu"
 		(exclude_from_sim no)
 		(at 309.88 153.67 90)
 		(effects
@@ -6931,7 +6931,7 @@
 		)
 		(uuid "5b739bae-d745-40a8-ae50-7a5347c97a38")
 	)
-	(text "+2 dBu"
+	(text "0 dBu"
 		(exclude_from_sim no)
 		(at 326.39 153.67 90)
 		(effects
@@ -6942,18 +6942,7 @@
 		)
 		(uuid "6f6b35af-84a9-4fa3-a65e-1e7069ced79d")
 	)
-	(text "For Input Gain of 3.9\nand VCC = 15V:\n2700 Ω: 11,99 dBu\n3900 Ω: 8,12 dBu\n2700 Ω: 3,86 dBu\n1500 Ω: 0,1 dBu\n1000 Ω: -3,8 dBu\n680 Ω: -8,03 dBu\n390 Ω: -11,89 dBu\n270 Ω: -16,17 dBu\n150 Ω: -19,95 dBu\n100 Ω: -23,87 dBu\n68 Ω: -28,15 dBu\n39 Ω: -32,08 dBu\n68 Ω to ground\n\n1.11 mA @ 15V\n(13.565 kΩ)"
-		(exclude_from_sim no)
-		(at 125.73 181.61 0)
-		(effects
-			(font
-				(size 1.27 1.27)
-			)
-			(justify left bottom)
-		)
-		(uuid "837bbffe-5c69-448c-aeef-c3425c1efa93")
-	)
-	(text "+6 dBu"
+	(text "+3 dBu"
 		(exclude_from_sim no)
 		(at 342.9 153.67 90)
 		(effects
@@ -6964,7 +6953,7 @@
 		)
 		(uuid "986522bd-170f-4ccd-8cac-2da073857442")
 	)
-	(text "-16 dBu"
+	(text "-15 dBu"
 		(exclude_from_sim no)
 		(at 243.84 162.56 90)
 		(effects
@@ -6986,7 +6975,7 @@
 		)
 		(uuid "c22d1026-dd14-4d0d-8c17-a021424e4a8e")
 	)
-	(text "-13 dBu"
+	(text "-12 dBu"
 		(exclude_from_sim no)
 		(at 260.35 162.306 90)
 		(effects
@@ -7008,7 +6997,7 @@
 		)
 		(uuid "ca4224d8-5383-42b2-950f-1d07264fd1f9")
 	)
-	(text "-28 dBu"
+	(text "-31 dBu"
 		(exclude_from_sim no)
 		(at 161.29 162.56 90)
 		(effects
@@ -7019,7 +7008,7 @@
 		)
 		(uuid "d1763fee-e3f1-4688-81c3-431023c47660")
 	)
-	(text "-26 dBu"
+	(text "-27 dBu"
 		(exclude_from_sim no)
 		(at 177.8 162.56 90)
 		(effects
@@ -7030,18 +7019,7 @@
 		)
 		(uuid "d21eb638-6e54-4e4c-a5c1-a26d4c4c79fd")
 	)
-	(text "PCB v0.3.3 Errata:\nChange values marked in bold:\n- C301, C314\n- R209, R323, R335"
-		(exclude_from_sim no)
-		(at 300.482 244.602 0)
-		(effects
-			(font
-				(size 1.27 1.27)
-			)
-			(justify left)
-		)
-		(uuid "df9dd8d1-4e63-4918-93f8-459539abf8cf")
-	)
-	(text "-5 dBu"
+	(text "-6 dBu"
 		(exclude_from_sim no)
 		(at 293.37 153.67 90)
 		(effects
@@ -7052,7 +7030,7 @@
 		)
 		(uuid "e070568a-9150-48b8-9426-023b3068093b")
 	)
-	(text "Buffer/ Rectifier\nGain: 8.2\n(LP filter loss ~7dB)"
+	(text "Buffer/ Rectifier\nGain: 12\n(LP filter loss ~7dB)"
 		(exclude_from_sim no)
 		(at 46.99 203.2 0)
 		(effects
@@ -9074,8 +9052,7 @@
 			(effects
 				(font
 					(size 1.27 1.27)
-					(thickness 0.254)
-					(bold yes)
+					(thickness 0.1588)
 				)
 			)
 		)
@@ -9084,8 +9061,7 @@
 			(effects
 				(font
 					(size 1.27 1.27)
-					(thickness 0.254)
-					(bold yes)
+					(thickness 0.1588)
 				)
 			)
 		)
@@ -10072,7 +10048,7 @@
 				(justify left)
 			)
 		)
-		(property "Value" "330R"
+		(property "Value" "1.5K"
 			(at 147.828 87.5721 0)
 			(effects
 				(font
@@ -10969,7 +10945,7 @@
 				)
 			)
 		)
-		(property "Value" "3.9K"
+		(property "Value" "3.3K"
 			(at 328.93 200.8124 90)
 			(effects
 				(font
@@ -11050,7 +11026,7 @@
 				)
 			)
 		)
-		(property "Value" "1K"
+		(property "Value" "1.2K"
 			(at 279.4 200.8124 90)
 			(effects
 				(font
@@ -11131,7 +11107,7 @@
 				)
 			)
 		)
-		(property "Value" "2.7K"
+		(property "Value" "2.2K"
 			(at 312.42 200.8124 90)
 			(effects
 				(font
@@ -11950,7 +11926,7 @@
 				)
 			)
 		)
-		(property "Value" "150R"
+		(property "Value" "270R"
 			(at 213.36 200.8124 90)
 			(effects
 				(font
@@ -12031,7 +12007,7 @@
 				)
 			)
 		)
-		(property "Value" "390R"
+		(property "Value" "470R"
 			(at 246.38 200.8124 90)
 			(effects
 				(font
@@ -12112,7 +12088,7 @@
 				)
 			)
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-		(property "Value" "270R"
+		(property "Value" "390R"
 			(at 229.87 200.8124 90)
 			(effects
 				(font
@@ -12769,7 +12745,7 @@
 				)
 			)
 		)
-		(property "Value" "100R"
+		(property "Value" "180R"
 			(at 196.85 200.8124 90)
 			(effects
 				(font
@@ -12848,8 +12824,7 @@
 			(effects
 				(font
 					(size 1.27 1.27)
-					(thickness 0.254)
-					(bold yes)
+					(thickness 0.1588)
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@@ -12858,8 +12833,7 @@
 			(effects
 				(font
 					(size 1.27 1.27)
-					(thickness 0.254)
-					(bold yes)
+					(thickness 0.1588)
 				)
 			)
 		)
@@ -12936,7 +12910,7 @@
 				)
 			)
 		)
-		(property "Value" "68R"
+		(property "Value" "150R"
 			(at 180.34 200.8124 90)
 			(effects
 				(font
@@ -13017,7 +12991,7 @@
 				)
 			)
 		)
-		(property "Value" "47R"
+		(property "Value" "100R"
 			(at 163.83 200.8124 90)
 			(effects
 				(font
@@ -13368,7 +13342,7 @@
 				)
 			)
 		)
-		(property "Value" "ye"
+		(property "Value" "rd"
 			(at 318.1096 156.3878 0)
 			(effects
 				(font
@@ -13394,7 +13368,7 @@
 				(hide yes)
 			)
 		)
-		(property "Description" "needs 145R @5V"
+		(property "Description" "needs 150R @5V"
 			(at 321.31 156.21 0)
 			(effects
 				(font
@@ -13403,7 +13377,7 @@
 				(hide yes)
 			)
 		)
-		(property "Model" "generic 20 mA, 2.1 V"
+		(property "Model" "generic 20 mA, 2.0 V"
 			(at 321.31 156.21 0)
 			(effects
 				(font
@@ -13412,7 +13386,7 @@
 				(hide yes)
 			)
 		)
-		(property "LCSC Part #" "C2296"
+		(property "LCSC Part #" "C84256"
 			(at 321.31 156.21 0)
 			(effects
 				(font
@@ -13557,7 +13531,7 @@
 				)
 			)
 		)
-		(property "Value" "ye"
+		(property "Value" "rd"
 			(at 301.5996 156.3878 0)
 			(effects
 				(font
@@ -13583,7 +13557,7 @@
 				(hide yes)
 			)
 		)
-		(property "Description" "needs 145R @5V"
+		(property "Description" "needs 150R @5V"
 			(at 304.8 156.21 0)
 			(effects
 				(font
@@ -13592,7 +13566,7 @@
 				(hide yes)
 			)
 		)
-		(property "Model" "generic 20 mA, 2.1 V"
+		(property "Model" "generic 20 mA, 2.0 V"
 			(at 304.8 156.21 0)
 			(effects
 				(font
@@ -13601,7 +13575,7 @@
 				(hide yes)
 			)
 		)
-		(property "LCSC Part #" "C2296"
+		(property "LCSC Part #" "C84256"
 			(at 304.8 156.21 0)
 			(effects
 				(font
@@ -14691,7 +14665,7 @@
 				)
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-		(property "Value" "rd"
+		(property "Value" "ye"
 			(at 202.5396 156.3878 0)
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 				(font
@@ -14717,7 +14691,7 @@
 				(hide yes)
 			)
 		)
-		(property "Description" "needs 150R @5V"
+		(property "Description" "needs 145R @5V"
 			(at 205.74 156.21 0)
 			(effects
 				(font
@@ -14726,7 +14700,7 @@
 				(hide yes)
 			)
 		)
-		(property "Model" "generic 20 mA, 2.0 V"
+		(property "Model" "generic 20 mA, 2.1 V"
 			(at 205.74 156.21 0)
 			(effects
 				(font
@@ -14735,7 +14709,7 @@
 				(hide yes)
 			)
 		)
-		(property "LCSC Part #" "C84256"
+		(property "LCSC Part #" "C2296"
 			(at 205.74 156.21 0)
 			(effects
 				(font
@@ -14880,7 +14854,7 @@
 				)
 			)
 		)
-		(property "Value" "rd"
+		(property "Value" "ye"
 			(at 186.0296 156.3878 0)
 			(effects
 				(font
@@ -14906,7 +14880,7 @@
 				(hide yes)
 			)
 		)
-		(property "Description" "needs 150R @5V"
+		(property "Description" "needs 145R @5V"
 			(at 189.23 156.21 0)
 			(effects
 				(font
@@ -14915,7 +14889,7 @@
 				(hide yes)
 			)
 		)
-		(property "Model" "generic 20 mA, 2.0 V"
+		(property "Model" "generic 20 mA, 2.1 V"
 			(at 189.23 156.21 0)
 			(effects
 				(font
@@ -14924,7 +14898,7 @@
 				(hide yes)
 			)
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-		(property "LCSC Part #" "C84256"
+		(property "LCSC Part #" "C2296"
 			(at 189.23 156.21 0)
 			(effects
 				(font
@@ -15069,7 +15043,7 @@
 				)
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+		(property "Value" "ye"
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 				(font
@@ -15095,7 +15069,7 @@
 				(hide yes)
 			)
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-		(property "Description" "needs 150R @5V"
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 			(at 172.72 156.21 0)
 			(effects
 				(font
@@ -15104,7 +15078,7 @@
 				(hide yes)
 			)
 		)
-		(property "Model" "generic 20 mA, 2.0 V"
+		(property "Model" "generic 20 mA, 2.1 V"
 			(at 172.72 156.21 0)
 			(effects
 				(font
@@ -15113,7 +15087,7 @@
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-		(property "LCSC Part #" "C84256"
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 				(font
@@ -15258,7 +15232,7 @@
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 				(font
@@ -15284,7 +15258,7 @@
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 			)
 		)
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 				(font
@@ -15293,7 +15267,7 @@
 				(hide yes)
 			)
 		)
-		(property "Model" "generic 20 mA, 2.0 V"
+		(property "Model" "generic 20 mA, 2.1 V"
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 				(font
@@ -15302,7 +15276,7 @@
 				(hide yes)
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 				(font
@@ -15970,18 +15944,16 @@
 			(effects
 				(font
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+					(thickness 0.1588)
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-		(property "Value" "8.2K"
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 				(font
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-					(thickness 0.254)
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@@ -17499,18 +17471,16 @@
 			(effects
 				(font
 					(size 1.27 1.27)
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 		)
-		(property "Value" "18K"
+		(property "Value" "15K"
 			(at 346.71 192.6336 90)
 			(effects
 				(font
 					(size 1.27 1.27)
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diff --git a/schematics/c3lingo_unit-assembly/c3lingo_unit-mix_io/c3lingo_unit-mix_io.kicad_sch b/schematics/c3lingo_unit-assembly/c3lingo_unit-mix_io/c3lingo_unit-mix_io.kicad_sch
index c11deeb..4cd85e3 100644
--- a/schematics/c3lingo_unit-assembly/c3lingo_unit-mix_io/c3lingo_unit-mix_io.kicad_sch
+++ b/schematics/c3lingo_unit-assembly/c3lingo_unit-mix_io/c3lingo_unit-mix_io.kicad_sch
@@ -6,10 +6,10 @@
 	(paper "A4")
 	(title_block
 		(title "c3lingo interpeter unit -- main I/O")
-		(date "2024-11-16")
-		(rev "v0.3.4")
+		(date "2024-12-18")
+		(rev "v0.4.0-dev")
 		(company "Jannik Beyerstedt (jtbx)")
-		(comment 1 "Prototype 2 + Rework")
+		(comment 1 "Prototype 3")
 	)
 	(lib_symbols
 		(symbol "Amplifier_Operational:LM358"
@@ -1902,167 +1902,6 @@
 				)
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 		)
 		(uuid "e3ff886d-ca90-4f52-ab7a-d119527a68af")
 	)
-	(wire
-		(pts
-			(xy 152.4 48.26) (xy 154.94 48.26)
-		)
-		(stroke
-			(width 0)
-			(type default)
-		)
-		(uuid "e70fb015-c1e0-459e-b85f-760102fb2fb1")
-	)
 	(wire
 		(pts
 			(xy 62.23 60.96) (xy 62.23 66.04)
@@ -5265,16 +4804,6 @@
 		)
 		(uuid "ed0b8485-603f-4e03-9a9f-9fef33176604")
 	)
-	(wire
-		(pts
-			(xy 27.94 107.95) (xy 27.94 110.49)
-		)
-		(stroke
-			(width 0)
-			(type default)
-		)
-		(uuid "ed0ba5f7-872f-497e-9c79-d0599356eb01")
-	)
 	(wire
 		(pts
 			(xy 203.2 114.3) (xy 203.2 115.57)
@@ -5355,30 +4884,6 @@
 		)
 		(uuid "fed1d135-90b6-4f39-b76d-4a3226071367")
 	)
-	(text "Input Module\nGain: -6 to +8 dB\nGain = (R_pot + R_22k) / R_47k\nLP_filter(R_pot): 130 - 22 kHz"
-		(exclude_from_sim no)
-		(at 137.16 80.01 0)
-		(effects
-			(font
-				(size 1.27 1.27)
-				(thickness 0.254)
-				(bold yes)
-			)
-			(justify left bottom)
-		)
-		(uuid "0e6e8fd4-2847-4ac2-8f21-94145fa64368")
-	)
-	(text "PCB v0.3.0 Errata:\nno rework required, but RV201 may be replaced"
-		(exclude_from_sim no)
-		(at 177.038 158.242 0)
-		(effects
-			(font
-				(size 1.27 1.27)
-			)
-			(justify left)
-		)
-		(uuid "5af07773-196e-45d6-9588-643821f779fb")
-	)
 	(text "Line driver\nGain: 6 dB"
 		(exclude_from_sim no)
 		(at 167.64 134.62 0)
@@ -5392,16 +4897,6 @@
 		)
 		(uuid "64f2c03b-4bbb-42b1-9346-ed13b3806702")
 	)
-	(text "RV201 can also be replaced by 10K fixed value"
-		(exclude_from_sim no)
-		(at 170.942 27.432 0)
-		(effects
-			(font
-				(size 1.27 1.27)
-			)
-		)
-		(uuid "98ee6894-4789-4f66-afcf-8e5a71ecf18c")
-	)
 	(text "Balanced Line Input Converter\nGain: 1\n220pF for HF rolloff (20 kHz)"
 		(exclude_from_sim no)
 		(at 80.01 78.74 0)
@@ -5415,7 +4910,7 @@
 		)
 		(uuid "f4a733a3-c185-40c1-b433-67420265f4bd")
 	)
-	(text "Summing Module\nGain: 0 dB"
+	(text "Summing Module\nGain: -6 dB"
 		(exclude_from_sim no)
 		(at 105.41 134.62 0)
 		(effects
@@ -5526,7 +5021,7 @@
 	)
 	(hierarchical_label "Stage"
 		(shape output)
-		(at 207.01 50.8 0)
+		(at 148.59 50.8 0)
 		(fields_autoplaced yes)
 		(effects
 			(font
@@ -6113,16 +5608,15 @@
 	)
 	(symbol
 		(lib_id "Amplifier_Operational:LM358")
-		(at 187.96 55.88 0)
-		(mirror x)
-		(unit 2)
+		(at 241.3 49.53 270)
+		(unit 3)
 		(exclude_from_sim no)
 		(in_bom yes)
 		(on_board yes)
 		(dnp no)
-		(uuid "00000000-0000-0000-0000-00005f926e3f")
+		(uuid "00000000-0000-0000-0000-00005f92849f")
 		(property "Reference" "U201"
-			(at 187.96 46.5582 0)
+			(at 241.3 41.275 90)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -6130,7 +5624,7 @@
 			)
 		)
 		(property "Value" "LM833-N"
-			(at 187.96 48.8696 0)
+			(at 241.3 43.5864 90)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -6138,7 +5632,7 @@
 			)
 		)
 		(property "Footprint" "Package_SO:SOIC-8_3.9x4.9mm_P1.27mm"
-			(at 187.96 55.88 0)
+			(at 241.3 49.53 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -6147,7 +5641,7 @@
 			)
 		)
 		(property "Datasheet" "https://www.ti.com/lit/ds/symlink/lm833-n.pdf"
-			(at 187.96 55.88 0)
+			(at 241.3 49.53 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -6156,7 +5650,7 @@
 			)
 		)
 		(property "Description" ""
-			(at 187.96 55.88 0)
+			(at 241.3 49.53 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -6165,7 +5659,7 @@
 			)
 		)
 		(property "Model" "LM833M or LM833MX (SOIC-8)"
-			(at 187.96 55.88 0)
+			(at 241.3 49.53 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -6174,7 +5668,7 @@
 			)
 		)
 		(property "LCSC Part #" "C473907"
-			(at 187.96 55.88 0)
+			(at 241.3 49.53 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -6183,71 +5677,72 @@
 			)
 		)
 		(pin "1"
-			(uuid "59c319c4-f546-4acc-a51f-82ff2d15612a")
+			(uuid "d9f99269-c9d7-4a1f-88c7-6110d4609168")
 		)
 		(pin "2"
-			(uuid "057f77ab-cf29-4571-9dea-3593f0cdd5f9")
+			(uuid "cfa653ae-c3ab-4955-8f6e-510d430df6fc")
 		)
 		(pin "3"
-			(uuid "6b25ad8a-fc69-492a-931b-de06bc34bc7c")
+			(uuid "0eb5c2e8-5e40-48cf-8dc0-ca35ae2a59c6")
 		)
 		(pin "5"
-			(uuid "ec2249a4-e69c-4191-90b3-58cf2db29f3b")
+			(uuid "357a033e-1a88-49ee-801e-f31a32c2a857")
 		)
 		(pin "6"
-			(uuid "cd1d38c7-3a3a-414a-874f-8cf44745847f")
+			(uuid "6b0482f6-3e68-49c9-a27d-c7ba3306a30a")
 		)
 		(pin "7"
-			(uuid "170d7a60-9c9f-447b-a504-e464a8ab5d12")
+			(uuid "c599508f-a7d8-43ab-90ef-8ae184104b74")
 		)
 		(pin "4"
-			(uuid "04d36b9d-467e-467c-a3ba-3683021e97c6")
+			(uuid "f6afb429-404f-47f0-a928-ff593fd08e63")
 		)
 		(pin "8"
-			(uuid "77a3640c-5b3d-423a-87cf-aa98817e541b")
+			(uuid "1f77bdac-fdbe-4059-8f54-14f1c30ac05d")
 		)
 		(instances
 			(project "c3lingo_unit-mix_io"
 				(path "/21e9fedd-b749-4b85-a03a-dffb926d039f"
 					(reference "U201")
-					(unit 2)
+					(unit 3)
 				)
 			)
 			(project "c3lingo_unit-assembly"
 				(path "/9e80d1ee-62c1-483d-830d-f559e7294d20/00000000-0000-0000-0000-000060ae0dae"
 					(reference "U201")
-					(unit 2)
+					(unit 3)
 				)
 			)
 		)
 	)
 	(symbol
-		(lib_id "Amplifier_Operational:LM358")
-		(at 241.3 49.53 270)
-		(unit 3)
+		(lib_id "power:GND")
+		(at 251.46 57.15 0)
+		(unit 1)
 		(exclude_from_sim no)
 		(in_bom yes)
 		(on_board yes)
 		(dnp no)
-		(uuid "00000000-0000-0000-0000-00005f92849f")
-		(property "Reference" "U201"
-			(at 241.3 41.275 90)
+		(uuid "00000000-0000-0000-0000-00005f93633d")
+		(property "Reference" "#PWR0204"
+			(at 251.46 63.5 0)
 			(effects
 				(font
 					(size 1.27 1.27)
 				)
+				(hide yes)
 			)
 		)
-		(property "Value" "LM833-N"
-			(at 241.3 43.5864 90)
+		(property "Value" "GND"
+			(at 251.587 61.5442 0)
 			(effects
 				(font
 					(size 1.27 1.27)
 				)
 			)
 		)
-		(property "Footprint" "Package_SO:SOIC-8_3.9x4.9mm_P1.27mm"
-			(at 241.3 49.53 0)
+		(property "Footprint" ""
+			(at 251.46 57.15 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -6255,8 +5750,8 @@
 				(hide yes)
 			)
 		)
-		(property "Datasheet" "https://www.ti.com/lit/ds/symlink/lm833-n.pdf"
-			(at 241.3 49.53 0)
+		(property "Datasheet" ""
+			(at 251.46 57.15 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -6264,8 +5759,8 @@
 				(hide yes)
 			)
 		)
-		(property "Description" ""
-			(at 241.3 49.53 0)
+		(property "Description" "Power symbol creates a global label with name \"GND\" , ground"
+			(at 251.46 57.15 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -6273,130 +5768,20 @@
 				(hide yes)
 			)
 		)
-		(property "Model" "LM833M or LM833MX (SOIC-8)"
-			(at 241.3 49.53 0)
-			(effects
-				(font
-					(size 1.27 1.27)
+		(pin "1"
+			(uuid "4e86f8f9-55c4-46b5-8036-10510fef4096")
+		)
+		(instances
+			(project "c3lingo_unit-mix_io"
+				(path "/21e9fedd-b749-4b85-a03a-dffb926d039f"
+					(reference "#PWR0204")
+					(unit 1)
 				)
-				(hide yes)
 			)
-		)
-		(property "LCSC Part #" "C473907"
-			(at 241.3 49.53 0)
-			(effects
-				(font
-					(size 1.27 1.27)
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-				(hide yes)
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-		(pin "1"
-			(uuid "d9f99269-c9d7-4a1f-88c7-6110d4609168")
-		)
-		(pin "2"
-			(uuid "cfa653ae-c3ab-4955-8f6e-510d430df6fc")
-		)
-		(pin "3"
-			(uuid "0eb5c2e8-5e40-48cf-8dc0-ca35ae2a59c6")
-		)
-		(pin "5"
-			(uuid "357a033e-1a88-49ee-801e-f31a32c2a857")
-		)
-		(pin "6"
-			(uuid "6b0482f6-3e68-49c9-a27d-c7ba3306a30a")
-		)
-		(pin "7"
-			(uuid "c599508f-a7d8-43ab-90ef-8ae184104b74")
-		)
-		(pin "4"
-			(uuid "f6afb429-404f-47f0-a928-ff593fd08e63")
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-		(pin "8"
-			(uuid "1f77bdac-fdbe-4059-8f54-14f1c30ac05d")
-		)
-		(instances
-			(project "c3lingo_unit-mix_io"
-				(path "/21e9fedd-b749-4b85-a03a-dffb926d039f"
-					(reference "U201")
-					(unit 3)
-				)
-			)
-			(project "c3lingo_unit-assembly"
-				(path "/9e80d1ee-62c1-483d-830d-f559e7294d20/00000000-0000-0000-0000-000060ae0dae"
-					(reference "U201")
-					(unit 3)
-				)
-			)
-		)
-	)
-	(symbol
-		(lib_id "power:GND")
-		(at 251.46 57.15 0)
-		(unit 1)
-		(exclude_from_sim no)
-		(in_bom yes)
-		(on_board yes)
-		(dnp no)
-		(uuid "00000000-0000-0000-0000-00005f93633d")
-		(property "Reference" "#PWR0204"
-			(at 251.46 63.5 0)
-			(effects
-				(font
-					(size 1.27 1.27)
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-				(hide yes)
-			)
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-		(property "Value" "GND"
-			(at 251.587 61.5442 0)
-			(effects
-				(font
-					(size 1.27 1.27)
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-			)
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-		(property "Footprint" ""
-			(at 251.46 57.15 0)
-			(effects
-				(font
-					(size 1.27 1.27)
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-				(hide yes)
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-		)
-		(property "Datasheet" ""
-			(at 251.46 57.15 0)
-			(effects
-				(font
-					(size 1.27 1.27)
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-				(hide yes)
-			)
-		)
-		(property "Description" "Power symbol creates a global label with name \"GND\" , ground"
-			(at 251.46 57.15 0)
-			(effects
-				(font
-					(size 1.27 1.27)
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-				(hide yes)
-			)
-		)
-		(pin "1"
-			(uuid "4e86f8f9-55c4-46b5-8036-10510fef4096")
-		)
-		(instances
-			(project "c3lingo_unit-mix_io"
-				(path "/21e9fedd-b749-4b85-a03a-dffb926d039f"
-					(reference "#PWR0204")
-					(unit 1)
-				)
-			)
-			(project "c3lingo_unit-assembly"
-				(path "/9e80d1ee-62c1-483d-830d-f559e7294d20/00000000-0000-0000-0000-000060ae0dae"
-					(reference "#PWR0204")
-					(unit 1)
+			(project "c3lingo_unit-assembly"
+				(path "/9e80d1ee-62c1-483d-830d-f559e7294d20/00000000-0000-0000-0000-000060ae0dae"
+					(reference "#PWR0204")
+					(unit 1)
 				)
 			)
 		)
@@ -6800,97 +6185,6 @@
 			)
 		)
 	)
-	(symbol
-		(lib_id "Device:C")
-		(at 158.75 38.1 270)
-		(unit 1)
-		(exclude_from_sim no)
-		(in_bom yes)
-		(on_board yes)
-		(dnp no)
-		(uuid "00000000-0000-0000-0000-00005fa035f7")
-		(property "Reference" "C201"
-			(at 158.75 31.6992 90)
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-			)
-		)
-		(property "Value" "47pF"
-			(at 158.75 34.0106 90)
-			(effects
-				(font
-					(size 1.27 1.27)
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-			)
-		)
-		(property "Footprint" "Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder"
-			(at 154.94 39.0652 0)
-			(effects
-				(font
-					(size 1.27 1.27)
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-				(hide yes)
-			)
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-		(property "Datasheet" "~"
-			(at 158.75 38.1 0)
-			(effects
-				(font
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-			(at 158.75 38.1 0)
-			(effects
-				(font
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-				(hide yes)
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-		(property "Model" "5% C0G"
-			(at 158.75 38.1 0)
-			(effects
-				(font
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-				(hide yes)
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-		)
-		(property "LCSC Part #" "C1671"
-			(at 158.75 38.1 0)
-			(effects
-				(font
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-				(hide yes)
-			)
-		)
-		(pin "1"
-			(uuid "086305be-741e-4c82-b8aa-768ca212761a")
-		)
-		(pin "2"
-			(uuid "daf0b82d-24d2-454c-97d1-42838049ed9e")
-		)
-		(instances
-			(project "c3lingo_unit-mix_io"
-				(path "/21e9fedd-b749-4b85-a03a-dffb926d039f"
-					(reference "C201")
-					(unit 1)
-				)
-			)
-			(project "c3lingo_unit-assembly"
-				(path "/9e80d1ee-62c1-483d-830d-f559e7294d20/00000000-0000-0000-0000-000060ae0dae"
-					(reference "C201")
-					(unit 1)
-				)
-			)
-		)
-	)
 	(symbol
 		(lib_id "Device:R")
 		(at 105.41 44.45 270)
@@ -7329,32 +6623,32 @@
 		)
 	)
 	(symbol
-		(lib_id "Device:R")
-		(at 143.51 50.8 270)
+		(lib_id "Connector:TestPoint")
+		(at 147.32 50.8 0)
 		(unit 1)
 		(exclude_from_sim no)
-		(in_bom yes)
+		(in_bom no)
 		(on_board yes)
 		(dnp no)
-		(uuid "00000000-0000-0000-0000-00005faa4c23")
-		(property "Reference" "R206"
-			(at 143.51 45.5422 90)
+		(uuid "00000000-0000-0000-0000-00005fc8be08")
+		(property "Reference" "TP201"
+			(at 147.32 42.545 0)
 			(effects
 				(font
 					(size 1.27 1.27)
 				)
 			)
 		)
-		(property "Value" "47K"
-			(at 143.51 47.8536 90)
+		(property "Value" "Stage"
+			(at 147.32 44.8564 0)
 			(effects
 				(font
 					(size 1.27 1.27)
 				)
 			)
 		)
-		(property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder"
-			(at 143.51 49.022 90)
+		(property "Footprint" "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm"
+			(at 152.4 50.8 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -7363,7 +6657,7 @@
 			)
 		)
 		(property "Datasheet" "~"
-			(at 143.51 50.8 0)
+			(at 152.4 50.8 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -7372,16 +6666,7 @@
 			)
 		)
 		(property "Description" ""
-			(at 143.51 50.8 0)
-			(effects
-				(font
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-				(hide yes)
-			)
-		)
-		(property "Model" ""
-			(at 143.51 50.8 0)
+			(at 147.32 50.8 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -7389,8 +6674,8 @@
 				(hide yes)
 			)
 		)
-		(property "LCSC Part #" "C17713"
-			(at 143.51 50.8 0)
+		(property "LCSC Part #" ""
+			(at 147.32 50.8 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -7399,53 +6684,50 @@
 			)
 		)
 		(pin "1"
-			(uuid "859f85fe-1755-4a36-bf83-63e049c04b95")
-		)
-		(pin "2"
-			(uuid "74575401-55ec-4496-bcb4-4dedd36a4ec6")
+			(uuid "41f03cca-5a2c-4703-a537-b23d8ac3a8d7")
 		)
 		(instances
 			(project "c3lingo_unit-mix_io"
 				(path "/21e9fedd-b749-4b85-a03a-dffb926d039f"
-					(reference "R206")
+					(reference "TP201")
 					(unit 1)
 				)
 			)
 			(project "c3lingo_unit-assembly"
 				(path "/9e80d1ee-62c1-483d-830d-f559e7294d20/00000000-0000-0000-0000-000060ae0dae"
-					(reference "R206")
+					(reference "TP201")
 					(unit 1)
 				)
 			)
 		)
 	)
 	(symbol
-		(lib_id "Device:R")
-		(at 158.75 48.26 270)
+		(lib_id "Connector:TestPoint")
+		(at 134.62 114.3 0)
 		(unit 1)
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 		)
 		(pin "4"
-			(uuid "2a671e20-738d-4b83-94fe-675688a8c5f0")
+			(uuid "46fbcf87-8752-456d-b95a-64507a19fc0d")
 		)
 		(pin "8"
-			(uuid "f286bc18-17fc-4b26-9138-ced5ab76e161")
+			(uuid "d064f2a7-f951-4b55-95dd-1feeeece41c6")
 		)
 		(instances
 			(project "c3lingo_unit-mix_io"
 				(path "/21e9fedd-b749-4b85-a03a-dffb926d039f"
 					(reference "U203")
-					(unit 3)
+					(unit 1)
 				)
 			)
 			(project "c3lingo_unit-assembly"
 				(path "/9e80d1ee-62c1-483d-830d-f559e7294d20/00000000-0000-0000-0000-000060ae0dae"
-					(reference "U203")
-					(unit 3)
+					(reference "U201")
+					(unit 2)
 				)
 			)
 		)
@@ -9053,7 +7421,7 @@
 				)
 			)
 		)
-		(property "Value" "22K"
+		(property "Value" "10K"
 			(at 114.3 106.2736 90)
 			(effects
 				(font
@@ -9097,7 +7465,7 @@
 				(hide yes)
 			)
 		)
-		(property "LCSC Part #" "C17560"
+		(property "LCSC Part #" "C17414"
 			(at 114.3 109.22 0)
 			(effects
 				(font