[sdiy] A question of CV ins

[David G Dixon]

For VCO frequency, I like: Coarse pot, Fine pot, 1V/oct (unattenuated), Expo
FM (1V/oct attenuated), Linear FM (attenuated).  Some like an additional
expo FM, but I've never had use for it.

For VCF frequency, I like: Coarse pot, Fine pot (if the VCF is also to be
used as a VCO or LFO), 1V/oct (unattenuated), FM1 (1V/oct attenuated,
monopolar) and FM2 (1V/oct attenuated, bipolar).  On VCFs I use the
monopolar FM1 inputs for cyclic modulation (LFOs) and the bipolar FM2 inputs
for envelope modulation.  I find the reversal of the envelope polarity into
the VCF to be one of the most interesting ways to modulate a VCF
(particularly BP, or HP/LP in series) to the extent that I often put the
envelope through a balanced modulator to modulate its polarity
automatically.

For VCF resonance, I like: Resonance pot, Res CV (attenuated), although I
must confess that I rarely use this feature.

For VCAs, I like: Input (attenuated), CV (attenuated, sometimes bipolar) and
CV Bias pot (adds a DC bias level to the VCA, acts as a volume control
independent of the Input attenuator and the CV signal, or a bias adjustment
to lift the CV signal into positive territory in the case of LFO control).
My VCAs are all expo/linear as well, and I have a Mode pot to morph smoothly
between the two.

On top of that, I put attenuators on virtually all inputs (audio and CV) to
any module, but never outputs.  The reason for this is because it allows a
single modulation or audio source to have independent effects on different
modules.