anyone doing this? it seems to work on my dx21. well, what i’m did 1st is put a photo-resistor in the output of the yamaha and lighting a LED with the a4 CV.
is it safe to do a direct connection as described below? it seems like it should work, i made the cable up to do it, tested with a multimeter, but…i’d like to double check. basically don’t put the tip into the a4 and you’re good?
see here under breath control for an explanation of what yamaha’s doing:
http://www.adambaby.com/studiotech_CS01.html
The breath control input takes a stereo miniplug (3.5mm), the tip of which expects to see about negative 9 volts supplied by the synth. The ring of this connector then provides a CV of between 0 and negative 5 volts (from the tests with my BC1) which goes to the two breath control pots on the synth, one for the VCF, one for the VCA, which allows scaling of the CV independently for those sections.
So all you have to do for external control is solder up a cable with a stereo plug at one end with the tip NOT connected, but with the ring connected to the centre wire, the other end of which connects to a mono plug which goes to your midi - CV converter (connect the earths to shield as normal).