diff --git a/README.md b/README.md
index 0cd583f..c54322a 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ General requirements:
     * Sum of all translators (XLR/ 6.3 mm balanced jack combo connector)
 
 All inputs (besides the microphones) and outputs should:
-- expect/ deliver a nominal level of +6dBu (german TV broadcast standard, 0 dBu = 0,775 Veff)
+- expect/ deliver a nominal level of +6dBu (~1.5 V RMS/ 4.3 V (p-p), german TV broadcast standard, 0 dBu = 0.775 V RMS)
 - be transformer balanced and galvanically isolated
 
 This results in a signal flow like this: ![](docs/signal-flow.jpg)
@@ -88,8 +88,7 @@ The casing should be a desk console (angled surface), ideally with space at the
 The electrical design consists of three identical channel strips, a line I/O board and a power supply.
 Each channel strip is separated in two boards, one for the top plate with the VU meter and main controls and one for the front panel with the headset jacks and headphone volume knob.
 
-The distance between top plate and PCB is 7 mm (determined by the potentiometers and on-air switch), which should also be suitable for standard 5 mm LEDs.
-Connectors and larger components will be mounted on the back side, so enough space behind the PCB is needed.
+The distance between top plate and PCB is 9 mm (determined by the potentiometers and on-air switch).
 The top plate should not exceed 2 mm thickness because of the potentiometer knobs, 1 to 1.5 mm would be ideal.
 
 The I/O boards (headphone and line signals) will just have components on the top side and might be steady enough by the XLR and 6.3 mm jack connectors.
diff --git a/bom.md b/bom.md
index 5693d04..944c7a8 100644
--- a/bom.md
+++ b/bom.md
@@ -1,6 +1,6 @@
 # Bill of Materials
 
-List of major components (resistors and ceramic caps without special requirements are left out).
+List of major components (resistors and capacitors are left out).
 
 All prices without VAT unless otherwise noted and without discount for higher order volume.
 
@@ -54,9 +54,6 @@ Electrolytic capacitors should have 25 V voltage rating, unless otherwise specif
 | 1     | NE5534                    | Low-noise bipolar Op-Amp          | PCBA  | JLC C9916
 | 1     | TL072{C,I,HI}DR           | Low-noise FET Op-Amp              | PCBA  | JLC C67473
 | 1     | TPA6111A2                 | Headphone Amp                     | 0.80  | JLC C497472
-| 3     | Cer. Cap. 100nF, lowESR   | SMD 0603                          | PCBA  | JLC C14663
-| 2     | Cer. Cap. 100nF C0G       | SMD 1206                          | PCBA  | JLC C97946
-| 2     | El. Cap. 68uF, lowESR     | SMD CP_Elec_5x5.8                 | PCBA  | JLC C178592
 | 3     | Generic SMD LED           | SMD LED 0805, green               | PCBA  | JLC C2297
 | 4     | Generic SMD LED           | SMD LED 0805, yellow              | PCBA  | JLC C2296
 | 6     | Generic SMD LED           | SMD LED 0805, red                 | PCBA  | JLC C84256
diff --git a/c3lingo_unit-assembly.pdf b/c3lingo_unit-assembly.pdf
index 8653b6d..8c47273 100644
Binary files a/c3lingo_unit-assembly.pdf and b/c3lingo_unit-assembly.pdf differ
diff --git a/schematics/c3lingo_unit-assembly/c3lingo_unit-assembly.kicad_sch b/schematics/c3lingo_unit-assembly/c3lingo_unit-assembly.kicad_sch
index 9247894..9eb4a4f 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 "2024-09-08")
-		(rev "v0.3.3")
+		(date "2024-11-16")
+		(rev "v0.3.4")
 		(company "Jannik Beyerstedt (jtbx)")
-		(comment 1 "Prototype 2")
+		(comment 1 "Prototype 2 + Rework")
 	)
 	(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 e2fa1f3..a1dacb2 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 "2024-09-08")
-		(rev "v0.3.3")
+		(date "2024-11-16")
+		(rev "v0.3.4")
 		(company "Jannik Beyerstedt (jtbx)")
-		(comment 1 "Prototype 2")
+		(comment 1 "Prototype 2 + Rework")
 	)
 	(lib_symbols
 		(symbol "Amplifier_Operational:NE5534"
@@ -3254,6 +3254,12 @@
 		(color 0 0 0 0)
 		(uuid "05f6d0eb-fc8c-4916-8fe9-98448adea6d5")
 	)
+	(junction
+		(at 113.03 63.5)
+		(diameter 0)
+		(color 0 0 0 0)
+		(uuid "13f15acf-505c-4ae4-a5cb-2511306f7b99")
+	)
 	(junction
 		(at 15.24 91.44)
 		(diameter 0)
@@ -3267,7 +3273,7 @@
 		(uuid "1cc7511e-329d-42e9-9f31-2eb5eed8f5e0")
 	)
 	(junction
-		(at 92.71 53.34)
+		(at 92.71 43.18)
 		(diameter 0)
 		(color 0 0 0 0)
 		(uuid "1e712c83-f508-45ea-b7ed-c3ebdc224bf6")
@@ -3404,6 +3410,12 @@
 		(color 0 0 0 0)
 		(uuid "d7123a8e-a94b-4474-9516-7cbb57fd159d")
 	)
+	(junction
+		(at 100.33 63.5)
+		(diameter 0)
+		(color 0 0 0 0)
+		(uuid "e1ce5d9a-0462-48b7-bea6-f4034acbb279")
+	)
 	(junction
 		(at 240.03 86.36)
 		(diameter 0)
@@ -3466,7 +3478,7 @@
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 	(wire
 		(pts
-			(xy 92.71 53.34) (xy 96.52 53.34)
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@@ -3536,7 +3548,7 @@
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 	(wire
 		(pts
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@@ -3704,6 +3716,16 @@
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 		(uuid "38093a3c-9ba1-4294-b7c2-cdc170badbea")
 	)
+	(wire
+		(pts
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+		(uuid "382ccf3e-175e-45a5-b8cf-056874c34f56")
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 		(pts
 			(xy 22.86 83.82) (xy 33.02 83.82)
@@ -3784,6 +3806,16 @@
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 		(pts
 			(xy 54.61 88.9) (xy 66.04 88.9)
@@ -3984,6 +4016,16 @@
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 		(uuid "65a1471e-9d3b-4920-9132-88b8be7a750d")
 	)
+	(wire
+		(pts
+			(xy 100.33 58.42) (xy 100.33 63.5)
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+		(stroke
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+			(type default)
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+	)
 	(wire
 		(pts
 			(xy 260.35 90.17) (xy 259.08 90.17)
@@ -4096,7 +4138,7 @@
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 		(pts
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@@ -4144,6 +4186,16 @@
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 		(pts
 			(xy 177.8 87.63) (xy 177.8 109.22)
@@ -4176,7 +4228,7 @@
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 		(pts
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@@ -4196,7 +4248,7 @@
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 	(wire
 		(pts
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@@ -4276,7 +4328,7 @@
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 	(wire
 		(pts
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@@ -4614,6 +4666,16 @@
 		)
 		(uuid "c5df4a98-3428-4c1a-8067-3ca269351db8")
 	)
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+		(pts
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+	)
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 		(pts
 			(xy 177.8 76.2) (xy 177.8 80.01)
@@ -4894,6 +4956,16 @@
 		)
 		(uuid "f25343e8-737d-4f95-8262-6ab28344baf7")
 	)
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+		(pts
+			(xy 113.03 58.42) (xy 113.03 63.5)
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 	(wire
 		(pts
 			(xy 66.04 60.96) (xy 66.04 63.5)
@@ -4916,7 +4988,7 @@
 	)
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 		(pts
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@@ -4954,9 +5026,9 @@
 		)
 		(uuid "ff4474e5-e6df-4454-a050-d2c8da3e9344")
 	)
-	(text "Mic Preamp\nGain: 35 dB"
+	(text "Mic Preamp\nGain: 35 dB\nLP-Filter: 10 kHz"
 		(exclude_from_sim no)
-		(at 71.12 101.6 0)
+		(at 71.12 107.442 0)
 		(effects
 			(font
 				(size 1.27 1.27)
@@ -4967,6 +5039,17 @@
 		)
 		(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)
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+			(justify left)
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+		(uuid "3093f7a4-c29f-4ab8-ae0c-d368da4b6ee5")
+	)
 	(text "Headphone driver\nGain: 3.9"
 		(exclude_from_sim no)
 		(at 184.15 111.76 0)
@@ -4982,7 +5065,7 @@
 	)
 	(text "48V: R = 6.81K\n24V: R = 1.2K\n12V: R = 680R"
 		(exclude_from_sim no)
-		(at 33.02 109.22 0)
+		(at 33.02 113.284 0)
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@@ -4993,7 +5076,7 @@
 	)
 	(text "Phantom Power\n(48V)"
 		(exclude_from_sim no)
-		(at 33.02 101.6 0)
+		(at 33.02 105.664 0)
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@@ -5971,7 +6054,7 @@
 	)
 	(symbol
 		(lib_id "power:-15V")
-		(at 92.71 45.72 0)
+		(at 92.71 35.56 0)
 		(unit 1)
 		(exclude_from_sim no)
 		(in_bom yes)
@@ -5979,7 +6062,7 @@
 		(dnp no)
 		(uuid "00000000-0000-0000-0000-00005f842347")
 		(property "Reference" "#PWR0801"
-			(at 92.71 43.18 0)
+			(at 92.71 33.02 0)
 			(effects
 				(font
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@@ -5988,7 +6071,7 @@
 			)
 		)
 		(property "Value" "-15V"
-			(at 93.091 41.3258 0)
+			(at 93.091 31.1658 0)
 			(effects
 				(font
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@@ -5996,7 +6079,7 @@
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-			(at 92.71 45.72 0)
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 					(size 1.27 1.27)
@@ -6057,9 +6140,10 @@
 		(in_bom yes)
 		(on_board yes)
 		(dnp no)
+		(fields_autoplaced yes)
 		(uuid "00000000-0000-0000-0000-00005f84960a")
 		(property "Reference" "R802"
-			(at 106.68 58.2422 90)
+			(at 106.68 66.2361 90)
 			(effects
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@@ -6067,7 +6151,7 @@
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 		(property "Value" "68K 1%"
-			(at 106.68 60.5536 90)
+			(at 106.68 68.6604 90)
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 				(font
 					(size 1.27 1.27)
@@ -6408,7 +6492,7 @@
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 	(symbol
 		(lib_id "Device:C")
-		(at 100.33 53.34 270)
+		(at 100.33 43.18 270)
 		(unit 1)
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 		(in_bom yes)
@@ -6416,7 +6500,7 @@
 		(dnp no)
 		(uuid "00000000-0000-0000-0000-00005f862fe2")
 		(property "Reference" "C803"
-			(at 100.33 46.9392 90)
+			(at 100.33 36.7792 90)
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@@ -6424,7 +6508,7 @@
 			)
 		)
 		(property "Value" "100nF, lowESR"
-			(at 100.33 49.2506 90)
+			(at 100.33 39.0906 90)
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 				(font
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 		(property "Footprint" "Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder"
-			(at 96.52 54.3052 0)
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 	(symbol
 		(lib_id "power:GND")
-		(at 114.3 54.61 0)
+		(at 114.3 44.45 0)
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@@ -6515,7 +6599,7 @@
 		(dnp no)
 		(uuid "00000000-0000-0000-0000-00005f8640b0")
 		(property "Reference" "#PWR0804"
-			(at 114.3 60.96 0)
+			(at 114.3 50.8 0)
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-			(at 114.427 59.0042 0)
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 		(property "Description" "Power symbol creates a global label with name \"GND\" , ground"
-			(at 114.3 54.61 0)
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 				(font
 					(size 1.27 1.27)
@@ -10438,6 +10522,106 @@
 			)
 		)
 	)
+	(symbol
+		(lib_id "Device:C")
+		(at 106.68 58.42 90)
+		(unit 1)
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(fields_autoplaced yes)
+		(uuid "76b3bc3c-1fba-416b-87aa-a44a26fb3d5a")
+		(property "Reference" "C801"
+			(at 106.68 52.1165 90)
+			(effects
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+			(effects
+				(font
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+		(pin "2"
+			(uuid "011fab9e-abc4-4039-83b3-cee8e5d6d557")
+		)
+		(pin "1"
+			(uuid "f56f7567-4f4c-414b-b1c4-3e39a24f1cc2")
+		)
+		(instances
+			(project "c3lingo_unit-assembly"
+				(path "/9e80d1ee-62c1-483d-830d-f559e7294d20/001e2d5e-c37c-4cd7-bab0-490d877b753d"
+					(reference "C801")
+					(unit 1)
+				)
+				(path "/9e80d1ee-62c1-483d-830d-f559e7294d20/84ace915-511d-4954-960a-419de0072a7d"
+					(reference "C601")
+					(unit 1)
+				)
+				(path "/9e80d1ee-62c1-483d-830d-f559e7294d20/8cedfc14-a68c-4815-b8a6-0fb8460e689b"
+					(reference "C701")
+					(unit 1)
+				)
+			)
+			(project ""
+				(path "/e8e18c84-573e-49d4-a903-1b430b6b9f6d"
+					(reference "C601")
+					(unit 1)
+				)
+			)
+		)
+	)
 	(symbol
 		(lib_id "power:GND")
 		(at 66.04 187.96 0)
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 db7a59a..0981421 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 "2024-09-08")
-		(rev "v0.3.3")
+		(date "2024-11-16")
+		(rev "v0.3.4")
 		(company "Jannik Beyerstedt (jtbx)")
-		(comment 1 "Prototype 2")
+		(comment 1 "Prototype 2 + Rework")
 	)
 	(lib_symbols
 		(symbol "Amplifier_Operational:LM358"
@@ -6861,7 +6861,7 @@
 		)
 		(uuid "0cde588a-546a-4466-b0e6-ce650deebd57")
 	)
-	(text "-16 dBu"
+	(text "-19 dBu"
 		(exclude_from_sim no)
 		(at 227.33 162.56 90)
 		(effects
@@ -6872,7 +6872,7 @@
 		)
 		(uuid "21dc4f4c-b380-4cb6-9ed6-408279643f23")
 	)
-	(text "-20 dBu"
+	(text "-22 dBu"
 		(exclude_from_sim no)
 		(at 210.82 162.56 90)
 		(effects
@@ -6907,7 +6907,7 @@
 		)
 		(uuid "3ed91943-91af-4f11-b5c0-3f35f0e07e9b")
 	)
-	(text "+4 dBu"
+	(text "-2 dBu"
 		(exclude_from_sim no)
 		(at 309.88 153.67 90)
 		(effects
@@ -6931,7 +6931,7 @@
 		)
 		(uuid "5b739bae-d745-40a8-ae50-7a5347c97a38")
 	)
-	(text "+8 dBu"
+	(text "+2 dBu"
 		(exclude_from_sim no)
 		(at 326.39 153.67 90)
 		(effects
@@ -6953,7 +6953,7 @@
 		)
 		(uuid "837bbffe-5c69-448c-aeef-c3425c1efa93")
 	)
-	(text "+12 dBu"
+	(text "+6 dBu"
 		(exclude_from_sim no)
 		(at 342.9 153.67 90)
 		(effects
@@ -6964,7 +6964,7 @@
 		)
 		(uuid "986522bd-170f-4ccd-8cac-2da073857442")
 	)
-	(text "-12 dBu"
+	(text "-16 dBu"
 		(exclude_from_sim no)
 		(at 243.84 162.56 90)
 		(effects
@@ -6975,7 +6975,7 @@
 		)
 		(uuid "b890b763-ce2a-4248-b5a2-23aec3e1b2ab")
 	)
-	(text "-4 dBu"
+	(text "-9 dBu"
 		(exclude_from_sim no)
 		(at 276.86 153.67 90)
 		(effects
@@ -6986,9 +6986,9 @@
 		)
 		(uuid "c22d1026-dd14-4d0d-8c17-a021424e4a8e")
 	)
-	(text "-8 dBu"
+	(text "-13 dBu"
 		(exclude_from_sim no)
-		(at 260.35 161.29 90)
+		(at 260.35 162.306 90)
 		(effects
 			(font
 				(size 1.27 1.27)
@@ -7008,7 +7008,7 @@
 		)
 		(uuid "ca4224d8-5383-42b2-950f-1d07264fd1f9")
 	)
-	(text "-32 dBu"
+	(text "-28 dBu"
 		(exclude_from_sim no)
 		(at 161.29 162.56 90)
 		(effects
@@ -7019,7 +7019,7 @@
 		)
 		(uuid "d1763fee-e3f1-4688-81c3-431023c47660")
 	)
-	(text "-28 dBu"
+	(text "-26 dBu"
 		(exclude_from_sim no)
 		(at 177.8 162.56 90)
 		(effects
@@ -7030,7 +7030,18 @@
 		)
 		(uuid "d21eb638-6e54-4e4c-a5c1-a26d4c4c79fd")
 	)
-	(text "+0 dBu"
+	(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"
 		(exclude_from_sim no)
 		(at 293.37 153.67 90)
 		(effects
@@ -7041,7 +7052,7 @@
 		)
 		(uuid "e070568a-9150-48b8-9426-023b3068093b")
 	)
-	(text "Buffer/ Rectifier\nGain: 12\n(3.9 + 10 dB (3.1)\nadd. headroom)"
+	(text "Buffer/ Rectifier\nGain: 8.2\n(LP filter loss ~7dB)"
 		(exclude_from_sim no)
 		(at 46.99 203.2 0)
 		(effects
@@ -7052,6 +7063,18 @@
 		)
 		(uuid "e0e4575c-d3f0-4633-9236-cfbcb6748cbc")
 	)
+	(text "470pF: ~15 kHz LP filter\n680pF: ~11 kHz LP filter"
+		(exclude_from_sim no)
+		(at 302.006 88.138 0)
+		(effects
+			(font
+				(size 1.27 1.27)
+				(thickness 0.1588)
+			)
+			(justify left bottom)
+		)
+		(uuid "f12f4f98-e993-4f42-b2cb-ad7cda04dc90")
+	)
 	(hierarchical_label "Mic_OthersB"
 		(shape output)
 		(at 251.46 264.16 90)
@@ -9051,14 +9074,18 @@
 			(effects
 				(font
 					(size 1.27 1.27)
+					(thickness 0.254)
+					(bold yes)
 				)
 			)
 		)
-		(property "Value" "22pF"
+		(property "Value" "680pF"
 			(at 294.64 45.4406 90)
 			(effects
 				(font
 					(size 1.27 1.27)
+					(thickness 0.254)
+					(bold yes)
 				)
 			)
 		)
@@ -9089,7 +9116,7 @@
 				(hide yes)
 			)
 		)
-		(property "LCSC Part #" "C1653"
+		(property "LCSC Part #" "C107055"
 			(at 294.64 49.53 0)
 			(effects
 				(font
@@ -9098,7 +9125,7 @@
 				(hide yes)
 			)
 		)
-		(property "Model" "5% C0G"
+		(property "Model" "5% NP0"
 			(at 294.64 49.53 0)
 			(effects
 				(font
@@ -12821,14 +12848,18 @@
 			(effects
 				(font
 					(size 1.27 1.27)
+					(thickness 0.254)
+					(bold yes)
 				)
 			)
 		)
-		(property "Value" "68R"
+		(property "Value" "220R"
 			(at 147.32 200.8124 90)
 			(effects
 				(font
 					(size 1.27 1.27)
+					(thickness 0.254)
+					(bold yes)
 				)
 			)
 		)
@@ -15939,14 +15970,18 @@
 			(effects
 				(font
 					(size 1.27 1.27)
+					(thickness 0.254)
+					(bold yes)
 				)
 			)
 		)
-		(property "Value" "12K"
+		(property "Value" "8.2K"
 			(at 77.47 162.1536 90)
 			(effects
 				(font
 					(size 1.27 1.27)
+					(thickness 0.254)
+					(bold yes)
 				)
 			)
 		)
@@ -17464,14 +17499,18 @@
 			(effects
 				(font
 					(size 1.27 1.27)
+					(thickness 0.254)
+					(bold yes)
 				)
 			)
 		)
-		(property "Value" "2.7K"
+		(property "Value" "18K"
 			(at 346.71 192.6336 90)
 			(effects
 				(font
 					(size 1.27 1.27)
+					(thickness 0.254)
+					(bold yes)
 				)
 			)
 		)
@@ -20813,16 +20852,16 @@
 		(fields_autoplaced yes)
 		(uuid "be3c5633-1f0d-4c46-811f-fefb86fe94e7")
 		(property "Reference" "C314"
-			(at 59.6392 97.79 90)
+			(at 68.961 96.5778 0)
 			(effects
 				(font
 					(size 1.27 1.27)
 				)
-				(hide yes)
+				(justify left)
 			)
 		)
-		(property "Value" "1uF"
-			(at 68.961 97.79 0)
+		(property "Value" "100nF"
+			(at 68.961 99.0021 0)
 			(effects
 				(font
 					(size 1.27 1.27)
@@ -20857,7 +20896,7 @@
 				(hide yes)
 			)
 		)
-		(property "LCSC Part #" "C15849"
+		(property "LCSC Part #" "C14663"
 			(at 66.04 97.79 0)
 			(effects
 				(font
@@ -20866,7 +20905,7 @@
 				(hide yes)
 			)
 		)
-		(property "Model" ""
+		(property "Model" "10% X7R 25V+"
 			(at 66.04 97.79 0)
 			(effects
 				(font
diff --git a/schematics/c3lingo_unit-assembly/c3lingo_unit-mix_io/c3lingo_unit-mix_io-gerber-v0.2.zip b/schematics/c3lingo_unit-assembly/c3lingo_unit-mix_io/c3lingo_unit-mix_io-gerber-v0.2.zip
deleted file mode 100644
index 8b490c3..0000000
Binary files a/schematics/c3lingo_unit-assembly/c3lingo_unit-mix_io/c3lingo_unit-mix_io-gerber-v0.2.zip and /dev/null differ
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 ad9994b..c11deeb 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 "2024-09-08")
-		(rev "v0.3.3")
+		(date "2024-11-16")
+		(rev "v0.3.4")
 		(company "Jannik Beyerstedt (jtbx)")
-		(comment 1 "Prototype 2")
+		(comment 1 "Prototype 2 + Rework")
 	)
 	(lib_symbols
 		(symbol "Amplifier_Operational:LM358"
@@ -5368,6 +5368,17 @@
 		)
 		(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)
@@ -5381,6 +5392,16 @@
 		)
 		(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)