Abstrakt Instruments Avalon Reference Manual page 41

2 ACCENT BEHAVIOR
When an accent has been programmed (or played) an additional control voltage (envelope) is sent to the filter and final amplifier (VCA). A slewed
copy of the filter envelope is sent to the filter control input. This is responsible for the characteristic wow sounds you can get with accented notes.
The character of this slewed version also varies with the setting of the RESONANCE control, as increasing resonance also increases the slew of this
control voltage. The plot below shows an example of this accent sweep envelope at maximum accent setting for minimum, mid, and max setting of
the resonance control.
3 MODULATION ENVELOPE VCA DEPTH
VCA DEPTH has been designed with a progressive voltage offset for negative (-) modulation amounts. When the control is rotated counter-
clockwise for (-) modulation a positive offset is applied to the VCA control input. For example, when VCA Depth is set to a negative amount and the
modulation envelope is not triggered, the VCA will remain open (drone). The plot below shows the behavior of (-) modulation for (4) settings of
negative VCA DEPTH.
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AVALON - Reference Manual