I know it's a crazy (bad) idea, but still: I hate having many cables attached to a music instrument when I move in the room. Let's take the example of a Akai MPC500 sampler: it is battery powered (so no power cable needed), but I still have 2 cables attached to it:
- a long 6.35 mono jack cable (unbalanced, it's ok for this purpose)
- a MIDI cable (DIN connector on both ends)
Question: could we make both a audio channel (20Hz-20kHz signal) and MIDI signal (serial data @31250 baud) transit in the same jack cable (i.e. only 2 wires: ground and signal)?
Probably with a filter, like when with ADSL 20 years ago, we could use Internet and someone talking on the phone (not VOIP but old analog phone) at the same time.
Something like that: