[sdiy] Triangle Core PWM sample

[Magnus Danielson]

From: Peter Grenader <peter at buzzclick-music.com>
Subject: [sdiy] Triangle Core PWM sample
Date: Sun, 06 Jun 2004 09:40:19 -0700
Message-ID: <BCE896EF.148A6%peter at buzzclick-music.com>

Hi Peter,

> To Magnus' request, I've done up a little sample of the effect of my PWM
> circuit taken directly from the triangle core of the VCO (there may be a
> unity gain amp slapped in between, can't remember right now).
> 
> Patch is as follows:
> 
> signal path:
> 
> One VCO - taking the OWM output, manually set to a short high pulse-->
> Lowpass gate --> reverb via Digital Performer-->ears.
> 
> control path:
> 
> Metric pulse from Squarwave LFO triggering 1) Blacet EG (any would do in the
> instance) and 2) Doepfer A-149-1 (Buchla SOurce of Uncertainty look-alike).
> Blacet EG is opening the Lowpass gate -and- in the second part of this
> sample, being routed to the PWM input of the VCO.
> 
> So, at first you'll hear the patch without PWM, THEN you'll hear the EG
> being plugged into the PWM input.  That's the only difference in this
> sample...but what a difference!

Um, how does this demo the difference between saw-based and tri-based PWM?

Anyway, it does demo the tri-based PWM, i.e. the "raw" PWM effect versus pure
fixed PWM waveshape. Similar but different test.

> Go here:
> 
> http://www.buzzclick-music.com/PWM_sample.mp3
> 
> Enjoy (or not),

I enjoyed it at least! ;O)

Don, let's bring at least one portable little synthesizer to that table, so
that we can "test" our theories in practice! ;O)

Cheers,
Magnus