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Using cv as control signal to Kyma

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Author	Topic: Using cv as control signal to Kyma
droolmaster0 Member	posted 31 December 2012 16:58 Just picked up a pacarana again, and am using an 828mk3. Someone reminded me that it's dc coupled, and mentioned that he had successfully sent cv to his modular synth from Kyma. I wanted to try in the other direction, and have had a little success, but the signal coming in is very unstable. Expert Sleepers makes Silent Way, and they will allow you to calibrate the signal and even convert it into OSC, but I run into this logical impasse. If the Kyma is controlling the 828mk3, then the Silent Way software isn't going to see it. Even if I spent on a second motu interface, as soon as I installed the drivers, I'd run into an issue. This seems so close, yet so far.... IP: Logged
SSC Administrator	posted 01 January 2013 12:45 This thread might have some useful tips on how to calibrate the output to use as control voltages: http://www.symbolicsound.com/cgi-bin/forumdisplay.cgi?action=displayprivate&number=4&topic=000056 IP: Logged
droolmaster0 Member	posted 02 January 2013 09:37 I'm mostly interested actually in receiving using cv and using as control signals in Kyma. I think that more is involved than just using a vca in the modular (?)....I've been conversing a bit with Os from expert sleepers, and he seems to be saying that I can use a couple of his euro modules to send the information into the ADAT ports of the 828, but that I"ll need to do some kind of AM demodulation in Kyma? I think that this will likely be over my head - translated into, I'm wary of throwing money at this without knowing that I can get it to work reliably. Edit: Looks like I misunderstood Os from Expert Sleepers - I think now that he's saying that I won't need the hardware if I can do the amplitude demodulation in Kyma. He pointed me to a wikipedia page, but I suspect that it will be a bit over my head to program this in Kyma...has anyone done something like this? http://en.wikipedia.org/wiki/Amplitude_modulation#Demodulation_methods Edit: SORRY for all of the edits. Finally understand him now. The idea is to do amplitude modulation of the signal in the modular, and then do the demodulation in Kyma. So, if I can figure out the demodulation part, I won't need to throw $ at extra hardware. I very much would like to use my blippoo box cv to control Kyma sounds.... [This message has been edited by droolmaster0 (edited 02 January 2013).] [This message has been edited by droolmaster0 (edited 02 January 2013).] [This message has been edited by droolmaster0 (edited 02 January 2013).] [This message has been edited by droolmaster0 (edited 02 January 2013).] IP: Logged
Douglas Kraul Member	posted 02 January 2013 16:06 I've not tested this per say but I think I understand what you are trying to accomplish. The amplitude modulation trick is used to work around AC coupling on the soundcard's inputs. If the soundcard has DC coupled inputs then it is unnecessary. In theory a DC coupled input can be sampled and used by Kyma as a control signal. Whether there is something in the system that prevents this I do not know. So best to try an experiment. Try creating a patch on your modular that will output a voltage determined by a knob positions. Some mixer modules have this sort of facility. Or just use a really slow LFO's sawtooth or triangle output. Send the CV to your soundcard's input. In Kyma create a basic patch that consists of something like and oscillator and and a soundcard input. Connect the input so that it does not "pass" to the audio path but also paste it as a control into the oscillator's frequency. If this works you should hear the frequency modulated by the CV from your modular. If it turns out you need to use the AM trick its actually pretty easy to set up a Kyma sound to "decode" it. Connect the soundcard input to an envelope follower and then adjust the envelope follower so it does not unduly modulate because of the carrier frequency. The envelope follower's output should closely follow the original CV. To encode the AM on your modular use a VCO running around 2 Khz to 4 kHz. Patch the sine output (or triangle if it lacks a sine) into a ring modular. A VCA can be used in a pinch but it will have to be a linear VCA and the gain setting will have to be such that the VCO modulation neither saturates the gain nor causes it to completely shut off. However you want to have the "deepest" modulation you can as that improves the CV "signal to noise" during decoding. Send the output of the RM/VCA to your soundcard input. Hopefully that should be enough to get you experimenting. Let us know what you uncover! Doug www.delora.com Makers of KymaConnect, vM2, vKiP, vKi, and vKA IP: Logged
droolmaster0 Member	posted 02 January 2013 17:13 This is great. Thanks - I'm pretty sure that the inputs (as opposed to the outputs) on the 828 mk3 are not dc coupled. The results were just so awful (compared to how the output works with cv signals from kyma) combined with the fact that in the Silent Way documentation they say that there are no current audio interfaces that have dc inputs.... So, I will try this out and post how it all works. IP: Logged
droolmaster0 Member	posted 03 January 2013 13:07 hmmm. I can't get it to work. I've tried both a Serge vca and ring modulator. I'm sending a simple sequence, but in playing a Kyma oscillator I notice that the pitch is unstable - it 'droops' after each note start. I'm using the Kyma amplitude follower sound - do I have this wrong? I'm not sure how to change the settings on it so that it works properly. Edit: ok! I can't get it to work using the Serge ring modulator, but I have it working using a vca. I do need to sharply attenuate the volume of the oscillator though. But yeah - sure - the sequencer values are modulating the Serge oscillator as expected. [This message has been edited by droolmaster0 (edited 03 January 2013).] IP: Logged
ChristianSchloesser Member	posted 09 January 2013 19:48 it might not be the cheapest way but this is very elegant: http://addacsystem.com/products/ADDAC000%20Series a full OSC to/from CV Eurorack system... i think it is perfect for the Kyma / Eurorack symbiosis and it will not eat up any audio inputs/outputs because there is an ethernet modul for example... i am considering giving it a try.. All the best Chris [This message has been edited by ChristianSchloesser (edited 09 January 2013).] IP: Logged

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