[sdiy] Midi 3.5mm cable

[Ingo Debus]

> Am 24.08.2016 um 16:42 schrieb Jason Lim <jason at jhjlim.com>:
> 
> What has thrown me off is the DIN pin numbering, which is weird and goes: 1, 4, 2, 5, 3 (1 and 3 being the outer pins)
> The wiring appears to be:
> 
> Tip: pin 4
> Ring: pin 5
> Sleeve: pin 2
> 

Yes, this is because in the old mono days DIN connectors had three pins. Then, with stereo, came the additional inner pins 4 and 5 for the right channel. When you plugged a 3-pin cable into a 5-pin socket you had at least the left channel playing back the mono signal.

Ingo