Tiptop Z4000 Envelope Generator - Manual (Page 3)

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From 50% and up, the segments set envelopes in the range of a second and up to
minutes and infinity with the release set to maximum.
Voltage Controlled Segments
Segment Control Knobs Range from 50% and up
The attack curve switch (ATK) switches the attack segment slope from exponential
to logarithmic. This has a subtle effect and can be heard best with envelopes
having long attack segments. Below are two scope shots of the same envelope
with the switch set in the two modes:
Attack Curve Switch
Each of the four segments in the Z4000 are voltage controlled. The effective voltage
input range for each input is 0 to 5V. Higher voltage levels or negative levels
will not damage the Z4000. For example, the Z8000 Matrix Sequencer has a voltage
range of 0 to 10V so the effective range for the Z8000 to control the Z4000
segments is up to 50% of the knob rotation. Please note that the incoming CV is
summed up with the internal voltage provided by the segment control knob, i.e. if
your Decay knob is set all the way to max, a CV in will do nothing as it has no
headroom left.
The CV inputs are what makes the envelope live, use them.