Make Noise MATHS - Manual (Page 12)

RISE/ FALL/ Vari-Response
These controls shape the signal that is output at the Unity Signal OUT and Variable OUT for CH. 1 and 4.
The RISE and FALL controls determine how fast or slow the circuit will respond to signals applied to the
Signal IN and Trigger IN. The range of times is larger than the typical Envelope or LFO. MATHS will create
functions as slow as 25 minutes (Rise and Fall full CW and external control signals added to go into
"slow-ver-drive") and as fast as 1khz (audio rate).
RISE sets the amount of time the circuit takes to travel up to the maximum voltage. When triggered the
circuit starts at 0V and travels up to 10V. RISE determines how long it takes for this to happen. When used to
process external control voltages the signal applied to the Signal IN is either increasing, decreasing or at a
steady state (doing nothing). RISE determines how fast that signal could increase. One thing MATHS cannot
do is look into the future to know where an external control signal is headed, therefore MATHS cannot
increase the rate at which an external voltage changes/ moves, it can only act upon the present and slow it
down (or allow it to pass at same speed).
FALL sets the amount of time the circuit takes to travel down to the minimum voltage. When triggered the
voltage starts at 0V and travels up to 10V, at 10V the upper threshold is reached and the voltage begins to
drop back down to 0V. FALL determines how long it takes for this to happen. When used to process external
control voltages the signal applied to the Signal IN is either increasing, decreasing or at a steady state (doing
nothing). FALL determines how fast that signal could decrease. Since it cannot look into the future to know
where an external control signal is headed, MATHS cannot increase the rate at which an external voltage
changes/ moves, it can only act upon the present and slow it down (or allow it to pass at same speed).
Both RISE and FALL have independent CV inputs for voltage control over these parameters. If attenuation is
required, use CH. 2 or CH. 3 in series to the desired destination. In addition to the RISE and FALL CV INs
there is also the BOTH CV INs. The BOTH CV input changes the rate of the ENTIRE function. It also
responds inversely to the RISE and FALL CV INs. More positive voltages make the entire function shorter
and more negative voltages make the entire function longer.
Vari-Response shapes the above rates of change (RISE/ FALL) to be Logarithmic, Linear or Exponential
(and everything in-between these shapes). With the LOG response, the rate of change DECREASES and
the voltage INCREASES. With EXPO response the rate of change INCREASES and the voltage
INCREASES. The LINEAR response has no change in rate as the voltage changes.
LOG EXPO LINEAR