User guide

20
PERCUSSION MODE
Percussion Mode is turned on and o by pressing the PERC. MODE buon. When Percussion Mode is acve,
as indicated by the illuminaon of the LED directly above the PERC. MODE buon, the output of the nonlin-
ear wave combiner is passed through an amplier whose gain is modulated by an exponenal envelope. This
envelope is triggered by a posive-going pulse on the SYNC input jack. The aack phase of the envelope is very
fast (less than 1 msec), and there is no sustain phase. The exponenal decay begins immediately with a me
constant that is set by the DECAY TIME parameter. When Percussion Mode is acve, pressing the DETUNE/DE-
CAY buon will allow the DECAY TIME parameter to be set with the rotary encoder and its value will be shown
in the boom row of the LCD display. The DECAY TIME parameter can also be modulated by the MOD B input,
which is acvated with a second press of the DETUNE/DECAY buon. When MOD B modulaon is acve the
lower row of the LCD display will change to show both the nominal seng and the oset provided by the MOD
B modulaon.
The minimum decay me is about 2msec (to half peak amplitude) and the maximum is about 3 seconds. The
mapping of the DECAY TIME parameter to actual decay mes is split into three disnct non-overlapping me
ranges. From 0-24 the decay mes 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, acng on a 1KHz sine wave.
The me axis shows a period of 100msec.