[sdiy] Experiment with bandlimited ramps

[Seb Francis]

As an experiment I synthesised a full bandwidth ramp in Sound Forge and 
noticed that this sounds like it has quite a lot more high frequency 
content that even the 150 harmonic file Tom posted.

http://burnit.co.uk/sdiy/stuff/FullBandWidthSaw.wav
I guess what I'm hearing as extra high frequency content here is in fact 
the aliasing distortion.

I also made a recording of a MOTM Saw as a comparison to the calculated 
waveform:
http://burnit.co.uk/sdiy/stuff/MOTM_Saw.wav (MOTM)
http://www.electricdruid.com/ramps/Ramp150.aiff (Tom's BLR)

I matched the level and frequency precisely and while it sounds pretty 
close, I have to say I do prefer the sound of the MOTM.  It sounds to 
me, dare I say it, "warmer" or more "alive".  That is to say that the 
mathematically generated waveform sounds more sterile.  It's subtle, but 
I do have a definite preference of the analog waveform.  I'm not really 
inclined to do any further waveform analysis but would be interested if 
someone else did...

Seb