Eventide H90 Harmonizer, Руководство пользователя

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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 12,000 Hz. Most of an electric
guitar’s sound spectrum is below 6,000 Hz. Any audio above 12,000 Hz (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 fi ltering. Slowly sweep the X-Over value from
100 Hz to 3,000 Hz 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 Env
X-Over to 0, set the X-
Over frequency between 400 Hz and 900 Hz, and adjust X-Over as needed.
Drive: This control adds warmth to the signal by mimicking the behavior of a tube ampli fi er’s
harmonic tremolo.
Env Depth: This control uses the amplitude envelope of the input to increase or decrease the
tremolo’s depth. Positive values increase the depth of the tremolo when you attack a note. The
depth will return to the level set by the Depth control as the note decays. Additionally, louder notes
will have greater depth than softer notes. Negative values reduce the tremolo when you attack a
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10. ALGORITHM GUIDE