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Noise or Contact Mic as a CV Source?
MUFF WIGGLER Forum Index -> Synth Noise  
Author Noise or Contact Mic as a CV Source?
zanadar
So I was thinking about doing this...what would I need to do to use static from a radio or a contact mic as a CV source for something?

Thanks for your input.
lopez-donado
you will need to amplify your signal and then detect the envelope. the doepfer a119 will do the trick and even give you a trigger signal based on your audio input ... my 2 cents y hope it helps.
zanadar
Thanks for that...that module looks mighty useful.
RealDudes
you could just use a crappy metal distortion to boost the level if youre looking for instant gratification
zanadar
So I'm coming to realize that there are specifications about levels, voltage, polarity, etc. that I really don't understand...is a CV fundamentally the same as an audio signal, with all the high frequency filtered out, or is it different?

Maybe there is a primer somewhere....

AH (from the Doepfer website):
Signals in the A-100

In the System A-100 there are three types of signal:

Audio Signals
Control voltages
Trigger voltages

Audio Signals are produced by the sound source Modules (such as VCO or NOISE), and lie in the range from -5 V to +5 V (10 VSS). The System A-100 can also let you use external Audio Signals (e.g. Microphone, Electric Guitar, Keyboard).
To interface satisfactorily, the level of external Audio Signals must be brought up to the A-100’s operating level.
Module A-119 (External Input), is ideal for this job, having among other things an internal pre-amp, and two inputs of different sensitivity.
Control voltages, as produced by modulation sources like the LFO and ADSR, are from -2.5 V to +2.5 V (5 VSS) for the LFO, and from 0 V to +8 V for the ADSR.
Trigger or Gate Signals, which start a process or function, are typically from 0 V to 5 V, with the trigger occurring as the leading edge of the waveform shoots up from 0 V to 5 V.
These definitions of the various signals, and the distinctions between them - sound sources and modulation sources - are right in principle, but a modular system like the A-100 often makes a mockery of them. In a modular set-up, all of the modules produce voltages, and can be used as control voltages or triggers, thus blurring the distinction between the various types.
For example, the output from an LFO can be used as an audio signal, as a control voltage for a VCF or VCA, or as a trigger signals for a sequence.
It’s just about true to say that anything can be modulated by anything else, so that a modular system gives the musician extraordinary flexibility and individuality.
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