electro harmonix frequency multiplexer

[Goddard, Duncan]

>>>It basically converts the frequency to an octave lower,
> in order to convert guitar into "bass".
> I saw a scope screenshot, sine in and (almost) sine out.<<<
> 
every one of these I've seen or used works the same (cheap) way; the input
is clipped or schmitt-triggered into a square-ish shape and then divided
down using "logic"...... then the result is lpf'd or waveshaped and mixed
back with the original. the boss/roland version is the best of a bad lot;
the modified signal on it's own has a weird timbre that doesn't really work
in a guitar-context. chords sound awful, obviously.
 
I came across a device a couple of years ago that was supposed to shift the
input signal *up* an octave; it was part of a fuzzbox called a "foxtone". my
task was to copy the interesting bit of this thing and squish it into a big
muff (oo-er!). it turned out to be a phase-splitter, with one output being
inverted and added then the new funny shaped waveform (all even harmonics, I
expect someone will point out) being waveshaped into something resembling a
sawtooth prior to further distortion. I was astonished to actually hear this
thing on a guitar instead of just looking at it on a 'scope. it worked very
well for lead parts but again, not for chords.

d.

(p.s. going home in a minute to play with phattytron)


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