User guide
20
PERCUSSION MODE
Percussion Mode is turned on and o by pressing the PERC. MODE buon. When Percussion Mode is acve,
as indicated by the illuminaon of the LED directly above the PERC. MODE buon, the output of the nonlin-
ear wave combiner is passed through an amplier whose gain is modulated by an exponenal envelope. This
envelope is triggered by a posive-going pulse on the SYNC input jack. The aack phase of the envelope is very
fast (less than 1 msec), and there is no sustain phase. The exponenal decay begins immediately with a me
constant that is set by the DECAY TIME parameter. When Percussion Mode is acve, pressing the DETUNE/DE-
CAY buon will allow the DECAY TIME parameter to be set with the rotary encoder and its value will be shown
in the boom row of the LCD display. The DECAY TIME parameter can also be modulated by the MOD B input,
which is acvated with a second press of the DETUNE/DECAY buon. When MOD B modulaon is acve the
lower row of the LCD display will change to show both the nominal seng and the oset provided by the MOD
B modulaon.
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 disnct 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, acng on a 1KHz sine wave.
The me axis shows a period of 100msec.