Make Noise MATHS Manual - page 13
RISE/ FALL/ Vari-Response
LOG
EXPO
LINEAR
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.
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