Alesis QS6.1 Reference Manual page 126

Aftertouch Depth (-99 to +99)
At +00, aftertouch has no effect on the amplitude. Applying aftertouch with this
parameter set to a positive value raises the amplitude; conversely, applying
aftertouch with a negative value will make the sound softer the harder you press.
The higher the number (either positive or negative), the greater the effect for a given
amount of aftertouch.
TIP:
Use aftertouch to ÒswellÓ the amplitude of string and horn parts. But please note:
Notes played at maximum velocity will probably not have the "headroom" available
for a positive-going amplitude swell. Try playing some soft, medium, and loud
notes while experimenting with this parameter.
Amp LFO Depth (-99 to +99)
At +00, the Amp LFO has no effect. Higher positive values increase the amount of
LFO modulation. Negative values give the same apparent effect, but with reversed
LFO phase (i.e., if the amplitude would normally be increasing with depth set to a
positive number, the amplitude would instead be decreasing at that same moment
had the depth been set to a negative number). Amp LFO parameters (such as speed
and wave shape) are programmed within the Amp LFO Function on button [8] (see
pages 145-146).
Note: If you hear no change when you alter this parameter, spend some time
experimenting with the Amp LFO Functions on button [8].
Another note: If your Amplitude LFO is using the Square, Up Saw, Down Saw, or
Random+ waveshapes, you may get a more pronounced effect if you use a negative
setting for Amp LFO Depth. See page 142 for more information about the various
LFO waveshapes.
TIP:
Amp LFO set to a triangle wave gives tremolo effects.
QS6.1 Reference Manual
Editing Programs: Part 8
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