Rump: The second half of a sine wave (Rump is the inverse of Lump). The low band’s waveform is
pointed at the maximum and rounded at the minimum. Like rump, this is a good shape for fast,
vibey tremolos.
Slope X: A curved ramp wave with an adjustable slope.
X = 0: downward curve for the low band, upwards curve for the high band
X = 50: symmetric curves for low and high (similar to the RUMP shape)
X = 100: upward curve for the low band, downwards curve for the high band
X-Over: This control determines where in the frequency spectrum the low band ends and the high
frequency band begins. In practice, each band rolls off around the crossover frequency, so they
overlap a bit. The X-Over control allows you to adjust the amount of overlap; see below.
To mimic an ordinary tremolo, set X-Over to its maximum value of 12,000Hz. Most of an electric
guitar’s sound spectrum is below 6,000Hz. Any audio above 12,000Hz (i.e., hardly any sound) will
be heard in the high band, and everything else will be heard in the “low” band. Change X-Over
gradually to morph into and out of an ordinary tremolo sound.
X-Over is especially interesting when Shape is set to an asymmetric shape such as Ramp Up. This
means that for each cycle of the tremolo the portion of the signal below the X-Over value will be
faded in and the portion of the signal above the X-Over value will be faded out. If you start playing a
scale below the X-Over frequency and continue playing above it, the shape of the tremolo will
appear to change as you cross over the X-Over frequency!
X-Overlap: This control adjusts the amount of overlap between the high and low bands. Negative
values will produce a cut at the crossover frequency, and positive values will produce a boost at the
crossover frequency.
To explore the effect of this control set:
X-Over to 100
Depth to 0
Env Depth to 0
Drive to 0
Env X-Over to 0
This removes the tremolo effect so you can hear the filtering. Slowly sweep the X-Over value from
100Hz to 3,000Hz as you play a repeated note, and listen for a boost at the crossover frequency.
Harmonic tremolo effects often have a scoop in the midrange near their crossover. You can emulate
this by using negative values for X-Over. To dial in classic sounds, set EnvX-Over to 0, set the X-
Over frequency between 400Hz and 900Hz, and adjust X-Over as needed.
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11. ALGORITHM GUIDE
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