Reverse-Engineering the ESI Maya1010 Analog I/O Port

Reverse-engineering the analog audio connector (DB44 HD) on an ESI Maya1010 pro soundcard I got without the original breakout panel. These cards were made in mid 2000s but you can still get drivers for the modern OSes, and now, thanks to Pipewire, they're mighty awesome in Linux! That's 8 channel input and 8 channel output goodness for ya :). Planning to switch over to ESI fully and disable the built-in soundcard. First (and done a long time ago) was tracing the ground pins. They're evenly spaced, 4 pins between them. I found GND at 4, 9, 14, 17, 22, 27, 35, 40. The reverse-engineering process differs slightly for input and output tracing. I traced the outputs by generating a 400Hz tone (command: ffplay -f lavfi -i "sine=frequency=400" -nodisp) and patching it to output channels on the Maya1010, one by one, and looking for them with an amp acting as a signal tracer. That's how I created an output channel map: OUT 1 - 23 OUT 2 - 37 OUT 3 - 36 OUT 4 - 6 OUT 5 - 5 OUT 6 - 19 OUT 7 - 1