Like Mark, I also prefer triangle to saw for LF and audio modulation (my next
preference would be for sine), part of my reason for suggesting it. But I do
think (again like Mark) that saw waves are very useful as audio sources, but
can't they also be used as clock or sync sources given the instantaneous rise
leads the falling ramp? I'm not sure why a pulse wave output (with a PW
control but no PWM input) is preferable to a square wave out -- is the PW
control alone that useful?
I also find sync to be far more interesting than PWM; so in the place of the
lowest pot, I can imagine having a sync input, and an output select switch
(to select between TRI/SAW). So here's my (revised) suggestion for the MOTM
310 1U VCO:
Controls:
COARSE
FINE
LIN FM
TRI/SAW (switch for output selection)
Inputs:
1V/OCT
LIN FM
SYNC
Outputs:
SQUARE
TRI/SAW
BTW: I also liked Chris's layout of a small MOTM system, and Joe's idea of
having a pot for waveshaping on the VCO (doesn't the Synthi have something
like that?), but I think that would be better suited for the through zero
linear FM VCO -- maybe a good place for that VC waveshaping circuit too.
What I don't like about my ARP VCOs:
1) Only VCO 2 has a PWM input.
2) Only VCO 2 has TRI and SINE outputs.
3) VCO 1 only has SQUARE and SAW outs, and VCO 3 has a SAW out, and a PULSE
out with a PW control.
4) No VCOs have SYNC.
My 3340 VCOs and MOTM 300s are great!
John B.
In a message dated 9/4/99 1:47:29 PM,
synth1@... writes:
>1) How about a Tri/Pulse VCO? This is a different circuit as a Saw/Pulse,
>but still easy to do in a small form-factor.
>2) Dave: How about a VCO Roundup of your gear? Compare/likes/dislikes