Alesis QS6.1 Reference Manual page 131

Part 8: Editing Programs
Sustain Pedal (On or Off)
This determines whether or not the Sustain Pedal will have an effect on the envelope.
When turned on, holding down the Sustain Pedal while playing short notes is
virtually the equivalent to holding down those notes on the keyboard with some
subtle but important differences. If the Delay and Attack are set to 0 and either the
Decay is 0 or the Sustain is 99, the envelope will immediately jump to the sustain
decay stage (if not already there) when the note is released and the sustain pedal is
held down. If a long attack is set, and the envelope has not reached the end of the
attack segment when the note is released, the envelope will jump immediately to the
Sustain Decay segment. If a long delay is set, and the envelope has not reached the
attack segment before the note is released, the envelope will remain at 0. However, if
Freerun is turned on, the envelope will continue through the delay, attack, decay and
sustain segments and remain at the sustain decay segment. This is exactly the same
as holding down the note on the keyboard. When the Sustain Pedal parameter is
turned off, the Sustain Pedal will have no effect on the envelope.
Level (00 to 99)
This is the overall output level of the envelope. If this is set to 00, the Pitch Envelope
will have no output and will have no effect, while at 99 it will have a maximum effect
on whatever it is being routed to.
TIP:
When selecting Pitch Envelope Level as a modulation destination, set the Pitch
Envelope level to 00 if the Modulation Level is above 0 (or, set the Pitch Envelope
level to 99 if the Modulation Amount is below 0).
Velocity Modulation (00 to 99)
This parameter is called VEL>PLevel in the display. It determines how keyboard
dynamics will affect the envelope level. When set to 99, note velocity controls the
envelopeÕs output; notes played hard will deliver a higher envelope output than
notes played soft. When set to 0, note velocity will have no effect on the envelopeÕs
output level.
Note: If the Penv Level is at 99, a positive value of any sort for VEL>PLevel will have
no effect. Likewise, if VEL>PLevel is at 99 and Penv Level is at 00, only low velocity
notes will allow a difference to be heard when you change the Penv Level value. This
is because the Pitch Envelope cannot reach an output level higher than 99. You must
add the Penv Level and VEL>PLevel values together to know if you are trying to
exceed that limit. So, if you have a Penv Level value of 40, you have enough
headroom in the Pitch Envelope to set VEL>PLevel to 59. But if the Penv Level is set
to 70 and VEL>PLevel is at 45, you're trying to get the Pitch Envelope to give an
output of 115 (which it can't do). In this scenario, you should scale back one or the
other (or both) until their combined values do not exceed 99.
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QS6.1 Reference Manual