Modulation algorithms
Crossfade
The carrier and modulator are crossfaded, using a
constant-power law. TIMBRE controls the crossfading
position – both signals are equally mixed at 12 o’clock.
Crossfolding
The carrier and modulator are summed, a tiny bit of
cross-modulation product is added to spice things up,
and the resulting signal is sent to a wavefolder, the
amount of which is controlled by TIMBRE.
Diode ring-modulation
The carrier and modulator are crudely multiplied, using
a digital model of a diode ring-modulator.
TIMBRE post-processes the resulting signal with a vari-
able amount of gain (and emulated diode clipping).
Digital ring-modulation
A gentler version of the previous algorithm which uses
a proper multiplication operation in the digital domain.
TIMBRE post-processes the signal with a gain boost and
soft-clipping.
Warps
Meta-modulator
Exclusive-or modulation
Both carrier and modulator are converted to 16-bit in-
tegers, and the two resulting numbers are XOR’ed bit by
bit. TIMBRE controls which bits are XOR’ed together.
Comparison and rectification
A handful of signals are synthesized through compari-
son and rectification operations typical of octave pedals.
TIMBRE morphs through these signals.
Vocoder
A digital model of a classic analog vocoder, with a bank
of 20 analysis and 20 synthesis third-octave 48dB filters.
The modulator sub-band signals are processed by
envelope followers which control the gains of each of the
carrier sub-band signals. TIMBRE warps the connec-
tions between the modulator’s envelope followers and
the carrier’s gain elements – effectively shifting up or
down the formants extracted from the modulator signal.
As the ALGORITHM knob is turned clockwise, the re-
lease time of the envelope followers is increased.
By turning the knob fully clockwise, the release time be-
comes infinite, and the spectral envelope of the carrier
is frozen.
Internal oscillator
Press the INT. OSC button
(C)
to enable the internal
oscillator or select its waveform.
Because cross-modulation algorithms work best with
harmonically simple signals, while vocoders work better
with harmonically rich signals, the available waveforms
are different depending on the active algorithm: sine, tri-
angle and sawtooth for the former, and sawtooth, pulse
and low-pass filtered noise for the latter.
Some of the inputs, outputs or controls operate differ-
ently when the internal oscillator is enabled:
• The LEVEL knob
(D)
and CV input
(1)
control the
oscillator frequency.
• The carrier audio input
(5)
phase-modulates the
internal oscillator, or feeds an external source of
noise into the low-pass filter.
• The AUX output
(8)
contains the signal generated by
the internal oscillator.
