Some experimentation shows:
voltage drifts back to 0V over about a second or so. 2) Headphone outlet of HDSP must be truly DC coupled because I can send continuous control voltage from there to analog synthesizer modules. 3) Range should be 2V peak to peak (I assume that means -2V to +2V, giving 4 octave range).
Should be possible with other cards which have some properly DC coupled outputs. I guess MOTU cards should work, as that's that the Volta app is designed for.
Have fun, D.
Derek Holzer wrote:
I got a bit interested by the (so far vapor-ware) MOTU Volta, and its promise of synth CV control from a DC coupled soundcard. I've got a Hammerfall DSP Multiface with DC-coupled inputs/oututs myself, and figure it couldn't be too difficult to whip up a Pure Data patch to interface with my Dopefer + homebrew modules. Is it done via PWM? Has anyone successfully gotten this to work? What about recording CV?
best! D.