[sdiy] VCO reset time

[Magnus Danielson]

From: Peter Grenader <peter at buzzclick-music.com>
Subject: Re: [sdiy] VCO reset time
Date: Sun, 06 Jun 2004 08:08:08 -0700
Message-ID: <BCE88168.14898%peter at buzzclick-music.com>

> Magnus Danielson or JH or Don...heck - one of you guys wrote:
> 
> >>>> 4. A Pulse-Width Modulated output based on triangle does not have
> >>>> the phase- modulation that a sawtooth based variant has. This may
> >>>> or may not be a good thing depending on what you are after.

Hand up! That would have been me who said it. I didn't originate this knowledge
thought, but I am happy to pass it on and verify it. I think I should pass the
credit/blame on Mattias Rickardsson for mentioning this to me. I'm sure this
have been discussed on and off for ages, but I haven't a recollection of it
other than possibly on this email-list.

> Very true - it's more interesting sounding if you ask me.  Although on a
> tube it's pure square, to the ear it sounds very rampy. Fast modulation can
> also cause almost chorus-sounding effects as there is an apparent slight
> shift in frequency when swept through at a hurried pace.  I slapped the tri
> source PWM circuit from Electronotes onto my triangle core VCO that I've
> been working on for, gosh, 10 years now, and I was 'blown away, dude' at
> this variant in which (one of you guys) spoke of here.  At first I was
> bummed out that it wasn't boilerplate PWM and was thinikng of taking the
> source from the ramp rather than the tri,  then  took the 'viva la
> difference' tact and ended up glad I did.

Ah! Now you got me hooked! ;O)

Would you like to contribute a few patches (possibly with sound-track) where
you think the tri-based variant excells over the standard saw-based variant?
Kind of giving us a taste of why one would like to have it. I don't have a
tri-based PWM in the house to the best of my knowledge (I am however suspecting
a few boxes). I could build one quickly thought.

Cheers,
Magnus