Forums > MaxMSP

CV out created in max- how?

December 4, 2011 | 6:13 pm

hi

I want to control the CV-in/expr-Pedal in on some (guitar) effect-Pedals by max. Those usually need a CV (control Voltage) of 0-5V. I could buy a midi-to-CV box, generate midi and "translate" it in CV, but I thought I could generate this directly in MAX. Expert sleepers have plug-ins which do that, using the audio output of (some) sound cards. Fine.
But what, in MSP, is a 0-5V signal???? A frequency? what pitch(es)? an amplitude? something else? how for exemple create a slow 0-5 sweep (which could then be the WWWWWHHHHHHHAAAAA of a Wha-wha)?

many thanks

kasper


December 4, 2011 | 8:03 pm

Salut Kasper,

a wha-wha on your bass? Not sure I will help you for this heresy ;-)

You need to send a DC to your sound card, for instance the output of sig~. In MSP you can set values between -1 and 1 (the amplitude), they will be converted by your soundcard into a CV, but the volt range depends on the soundcard. And some soundcards just doesn’t work with DC (but will work with slow changing values, like a LFO). If you have a RME card, only the headphone output will work with DC (with a range about something like-2 2 V – sorry I don’t have my sound card at hand to test). MOTU cards work better for DC outputs. There are plenty posts on this topic in this forum.
Best,

p


December 4, 2011 | 8:05 pm

The advantage of a MIDI->CV box are that there are a lot to choose from, and support for MIDI in Max is robust.

The advantage of something like Expert Sleepers’ Silent Way, or MOTU Volta is that the output can be at audio rate. This type of solution may be slightly more fiddly to use.


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