FW: completely *reasonable* question...

[Dan Gendreau]

> Hi everyone,
...
> I want to build a selfoscillating "tonebox", a VCO and a VCF, which has a
> constant output.
Not sure what you mean by constant output... You mean no VCA?

> What should the cv input to the VCO be, more specific:
> what is the standard cv range for pitch. Is it +5V to -5V?

The VCO CV is most often formatted as a 1V/Octave signal. Each 1V increase
results in a 1 octave increase in pitch. Internally, a VCO usually needs a
CV that ranges from 0V to "whatever your max octabe is" (typically 10V).

In normal applications, your box would have a VCO CV input jack and a
coarse/fine tune knobs or switches. The actual CV going into the VCO would
be a sum of these controls/signals.

Therefore, it is quite reasonable to put negative voltages into your VCO CV
input (If you were feeding audio waveforms into the VCO CV jack for example)
as long as the total sum (going to the VCO) is not negative.

I hope that helps clear things up a bit,
-Dan G.