[sdiy] Ice Box questions

[med]

Heya! I have an Ice Box (DOD FX64) chorus pedal. From the looks of it,
it modulates the clock of a short delay line (that's what the MN chips
are, right)up and down in order to raise and lower the pitch in a
"chorus"-ey manner. However, it doesn't actually *do* this much of the
time, instead turning on and letting signal pass but not changing
pitch. Some other times when it works, one can hear a noticable "thump
thump thump" from the box, usually when the signal is at its lowest
pitch.
So the question is, anyone familiar with this pedal and how it works?
Where's the "lfo" on it? If any the top-of-box pots (i think the one
for "depth") show the waveform, then in the course of "scoping" out
the pedal it's exactly half a sine wave. It's a pretty nice effect for
"slight-vibrato" to "almost-ringmodulated" sounds when it works, but
it seems to never want to work.

-MED

-P.S. Back when it still worked, I connected one of the outputs back
to the input. It sounded very cool and siren-like. (even cooler was
throwing a wah in the "feedback loop" -- if I had a delay i would've
put that there too) But could this've been what killed it? I shudder
to think of a stomp box without some kind of circuitry-protecting
diodes on the input...