I have a use case when there is multi probe data form SpikeGLX with the following structure:

├── probe_1
│   ├── npx.imec.ap.bin
│   └── npx.imec.ap.meta
├── probe_2
│   ├── npx.imec.ap.bin
│   └── npx.imec.ap.meta
└── probe_3
    ├── npx.imec.ap.bin
    └── npx.imec.ap.meta

The problem is that the probe index was omitted from the name. The pattern {device}{probe_index} is used as a stream_index so in this case we are unable to open this file and the error in this line is triggered:

The solution, I think, is to determine the probe index directly from the metadata and use that to tell the streams apart. I have some stubbed test data and a patch that I will push soon.