Some experimentation shows:

1. Normal outlets of HDSP must have some DC coupling because continuous

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.

On May 8, 2009, at 3:32 AM, 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,

CDM says that RME interfaces are NOT DC coupled

http://createdigitalmusic.com/2009/04/29/motu-volta-mac-software-plug- in-for-your-analog-gear-now-shipping/

and Volta is 250 USD dongle ware, so better be sure

Jurgen

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.

-- ::: derek holzer ::: http://blog.myspace.com/macumbista ::: http://www.vimeo.com/macumbista ::: ---Oblique Strategy # 149: "Take a break"

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