MOTM

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