Tiptop Z2040 4-Pole VCF - Manual (Page 5)

Please Note: When the VCA is configured to filter
output it will block the sound, only by applying a CV
to the VC-Gain input will it open the VCA for sound to
pass through.
The front panel Gain knob functions totally independent
of the VCA and only sets the input Gain regardless of
the VCA position (VCA on Input or output). When the
VCA is configured to the Input then the audio from the
VCA and from the Gain Knob are mixed together. When
the VCA is configured at the output the gain knob
affects only the input, the idea behind that is to, the
idea behind that is to maintain control of the Input
Gain even if the VCA is set to the Output.
Understanding the Z2040’s unique
gain stage:
The following describes the behavior of the Z2040 at
three different positions of the Gain knob:
MIN - just before 0db:
In this range the Z2040 will sound and behave similarly
to the SSM2040 filter chip. The ratio between
resonance and input signal is set in a similar way to
that of the original SSM2040. This means the Input
signal’s volume will drop when Resonance is increased.
This range has a low distortion and will reproduce the
“sweet” sound of the SSM2040.
(cont. on pg.6)