Yamaha VL-7 Owner's Manual page 110

Feature Reference
Phase (Modulator only)
This parameter is provided for the modulator block only. It allows a degree of
timbral variation by varying the phase of the modulator signal through 360 degrees in 2-
or 3-degree increments.
Index (Modulator only)
Determines how much modulation is applied to the carrier signal (i.e. the level of
the modulator signal applied to the carrier). The higher the value the greater the modula-
tion.
Notes On Using the Harmonic Enhancer
Although any modulator source signal can be applied to any carrier
source signal, two approaches are recommended when attempting to create
an acoustic instrument simulation.
The first is to set the carrier signal to "Normal" and the modulator
signal to any setting other than normal, set the dry/wet "Balance" to 63
(all wet), and set a relatively high "Index" value. In this case the total
output of the instrument model ("Normal" signal) will by modulated by
one of the component signals, so the dry/wet "Balance" can be set to
fully wet (carrier output only) since the carrier source and dry signals are
essentially the same. The Index parameter determines how much modula-
tion is applied, so a higher value is generally required to create sufficient
variation.
The second approach is to set the carrier signal to any setting other
than normal and the modulator signal to any of the six possibilities, set the
dry/wet "Balance" to a more central value, and set a relatively low
"Index" value. In this situation it is necessary to set the "Balance"
more toward the "Dry" side since the carrier source signal is not the
normal signal and at least some of the dry signal is necessary to provide the
basic sound of the instrument model. In other words, the sound produced by
the Harmonic Enhancer is simply added to the basic sound of the
instrument, in contrast with the first approach in which the basic sound of
the instrument is modulated directly.
Please note that these are only guidelines, and are by no means the
only way to work with the Harmonic Enhancer. Since the Harmonic En-
hancer tends to respond differently with different instrument models,
experimentation and experience are your most valuable tools.
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