Intellijel Atlantis - Manual (Page 52)

The cutoff frequency is normalled to the ENVELOPE section generator. Set the amount of ENVELOPE modulation with the ENV slider, and choose the polarity
(positive or negative) with the ENV POLARITY switch. Note that you can engage the ENVELOPE generator by using a gate signal or with the CYCLE switch.
ENVELOPE modulation
VCF section - 14
ENVelope modulation amount
VCF out to VCA section
VCF out
adjust initial cutoff frequency
+ENVELOPE modulation
+8V
-8V
t
-ENVELOPE modulation
+8V
-8V
t
GATE signal