Tiptop Z-DSP - Manual (Page 12)

Looking into Voltage Control. - Cont
input accepts positive voltages from 0-5V though
higher values are fine and will not damage the module.
For some sonic chaos, try pulsing this input from an
analog sequencer such as the Z8000 Matrix
Sequencer/Programmer. More on this in the Program
Switching section.
Overall the Z-DSP inputs are well protected against
excessive voltages on the inputs. We do recommend
however to stay within a reasonable range especially in
case of using the Z-DSP with modular systems of
different format and power supply as the Eurorack
standard.