Intellijel Cylonix Shapeshifter v1.03 - Manual (Page 20)

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PERCUSSION MODE
Percussion Mode is turned on and off by pressing the PERC. MODE button. When Percussion Mode is active,
as indicated by the illumination of the LED directly above the PERC. MODE button, the output of the nonlin-
ear wave combiner is passed through an amplifier whose gain is modulated by an exponential envelope. This
envelope is triggered by a positive-going pulse on the SYNC input jack. The attack phase of the envelope is very
fast (less than 1 msec), and there is no sustain phase. The exponential decay begins immediately with a time
constant that is set by the DECAY TIME parameter. When Percussion Mode is active, pressing the DETUNE/DE-
CAY button will allow the DECAY TIME parameter to be set with the rotary encoder and its value will be shown
in the bottom row of the LCD display. The DECAY TIME parameter can also be modulated by the MOD B input,
which is activated with a second press of the DETUNE/DECAY button. When MOD B modulation is active the
lower row of the LCD display will change to show both the nominal setting and the offset provided by the MOD
B modulation.
The minimum decay time is about 2msec (to half peak amplitude) and the maximum is about 3 seconds. The
mapping of the DECAY TIME parameter to actual decay times is split into three distinct non-overlapping time
ranges. From 0-24 the decay times range from about 2msec to 3 msec, 25-49 ranges from about 20-30 msec,
50-99 ranges from about 50 msec to 3 seconds.
The output in PERC. MODE when the DECAY TIME parameter is set to 30, acting on a 1KHz sine wave.
The time axis shows a period of 100msec.