[sdiy] Sound samples for Obesifier Waveform Animator are up

[Scott Bernardi]

The saw animator output is pretty identical to the original MWPA, when 
the LFO's are set in the subaudio range.  The frequency settings were 
suggested by Bernie in the Electronotes article; the idea was to spread 
them so that there was no harmonic relationship between them. Bernie 
sites an article from EN #40 by Ralph Burans who was trying to come up 
with frequency spacing for filter banks, and hit upon a spacing of the 
fifth root of 2.1 which gives no harmonic overlap in a 10 octave range.  
I just used a table from the EN #87 article for resistor values.
Now that I've played with the obesifier for a while, I'd do it a bit 
different. I'm finding that there is not much perceivable difference 
having the variable frequency LFO's until you get them up into the audio 
range; and then the best sounds come when you use a VCO for external 
animation control that tracks the input VCO.  So if I did the circuit 
again (Obesifier Jr? The Phat Boy returns?) I would cut it down to six 
animator stages, get rid of the adjustable LFO's and drive all six 
stages with fixed frequency LFO's, but bring out panel jacks so that the 
internal fixed LFO could be overridden by an external VCO for animation 
modulation on two of the stages.
I also found a mistake in the saw to tri converters on two stages; with 
it fixed the animated tri output is mellower and less like the animated 
saw output than the samples I have up right now. When I get a chance 
I'll redo the animated tri sample.

groovyshaman at snet.net wrote:

>This is really a great sounding module - nice job Scott!
>Any idea how this sounds compared to the "original" E-notes circuit?  How
>did you arrive at the settings for the fixed LFO frequencies?
>
>George
>
>
>  
>

-- 
Scott Bernardi
sbernardi at comcast.net