[sdiy] Triangle Core PWM sample

[Scott Stites]

Hi Peter (and list),

I haven't had a chance to check out the sample yet (preventive firewall where I'm at right now), but I sure am interested.

This may sound a bit odd, but the best sounding PWM I've worked with comes from nothing other than the Blacet Dark Star Chaos 2000.  It just sounds so jangly and sweet.  I don't know if it's to do with the limits John set on the PWM, or if it's the SN76477, but I sure wish I had an expo version of that sound.

Anyone on the list have any thoughts on that - for example, someone who understands the inner workings of the SN76477?  Does it have any bearing on the triangle/sawtooth core discussion?

Cheers,
Scott


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


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