Kurzweil K2700 Musician's Manual page 111

Program Edit Mode
The Amplitude Envelope (AMP ENV) Page
Adjust
Use the Adjust parameter to offset the envelope rate of each amplitude section.
When a control source is selected for the Source field, use the Adjust and Depth fields to set
the range of envelope control. When the control source selected for the Source field is at it's
minimum value, the Adjust amount is applied to the rate of the selected amplitude section.
When the control source selected for the Source field is at any value above it's minimum
value, the Adjust amount is applied to the rate of the selected amplitude section and added to
the control source's current value multiplied by the Depth parameter.
Keytrk
Use the Keytrk parameter to control the envelope rate of each amplitude section based on the
MIDI note number of each key played. Applying Keytrk to the Release segment is useful for
emulating acoustic string and percussion instruments, in which lower notes often have longer
release times, and higher notes often have shorter release times.
Keytrk uses the MIDI note number of each key as a control source. When Keytrk is greater
than 1.000x, notes above C 4 will make the envelope section run faster, while notes below C
4 will make it run slower. When Keytrk is less than 1.000x, notes above C 4 will make the
envelope section run slower, and notes below C 4 will make it run faster.
VelTrk
Use the VelTrk parameter to control the envelope rate of the attack amplitude sections based
on the MIDI velocity of each key played. Applying VelTrk is useful for emulating bowed
acoustic string instruments, in which louder notes often have faster attack times, and softer
notes often have longer attack times.
When the value of this parameter is greater than 1.000x, attack velocities greater than 64
make the attack section run faster, and attack velocities below 64 make it run slower.
VelTrk is not available for the decay and release segments, however you can achieve a similar
control by selecting attack velocity (GAttVel) as a control source for the Decay or Release
Source parameters.
Source
Use the Source parameter to assign a control source to control the envelope rate of each
amplitude section. Use the Adjust and Depth fields to set the range of envelope control.
Depth
Use the Depth parameter to set the range of envelope control for the controller set in the
Source field.
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