[sdiy] Pink?

[Mike Beauchamp]

> So, why aren't VCOs and VCFs more spectrally pink?
> Have there been any attempts historically to alter their characteristics 
> a bit in synths? :-)

Not really a synth, but the heterodyne oscillators of early theremins 
produced a very pleasing waveform that changed with frequency. Not 
exactly sure how, I think getting more sinusodal as frequency increases 
- but I haven't seen one on the scope personally. I recently did track 
down an original vacuum tube RCA Theremin close by and I'm hoping to do 
some measurements on it soon.

The other frequency-dependent waveform change I see in some gear is when 
square waves can't maintain their peaks at very low frequency look more 
like saw-tooth waves - which I always thought was due to strain on the 
power supply?

Interesting topic, mathematically perfect waveforms do feel straining.

Mike