[sdiy] New Waveform Animator Module

[Scott Bernardi]

Interesting that the subject of waveform animation came up; I just 
finished a new waveform animator module - I call it the Obesifier 
because it makes your synth sound Real Phat!
OK, I apologize for the corny name.  This is an enhancement to the 
original Multi Phase Waveform Animator (MPWA) based on an Electronotes 
circuit.  It takes a saw, tri, or sine input, and has 8 independent tri 
LFO's that perform a "symmetricised  ramp modulation" (kind of like PWM 
for sawtooth waveforms) and sums the outputs. Six of the on board LFO's 
are fixed frequency, and two are frequency adjustable. Also one of the 
adjustable LFO's can be overridden with an external VCO.  The adjustable 
LFO outputs are brought out to panel jacks with level controls so they 
can be used elsewhere.
The result of the 8 stages of modulation gives a lush, ever changing 
pattern that sound phatter than 3 beating VCO's, but only takes one VCO 
to drive it.  Really great for drones. Plus the waveforms look really 
cool on a scope.
There are two types of outputs: animated "saw" (actually it's just a saw 
if you drive the input with a saw), and animated triangle.  The animated 
triangle takes each of the modulated saw output from each stage, runs 
them thru a saw to triangle converter, and sums the outputs. Looks like 
a piecewise linear waveform where the segment endpoints are constantly 
changing. It has a mellower sound than the animated saw output.
I should get some sound samples up next week, but schematics are posted now.
http://home.comcast.net/~sbernardi/elec/og2/og3_obesifier.html

-- 
Scott Bernardi
sbernardi at comcast.net