Lexicon PCM 90 - REV 1 User Manual page 78

PCM 90 User Guide
Modulation cont'd.
3-18
Mod: Sw 1 and Mod: Sw 2
These are identical time switches. Each has five parameters: Rate, P Width,
Mode, T Lvl and T Src.
Rate sets the speed (0-10Hz) at which the switch cycles. It can
be set in time values (such as 1.5 Hz) or tempo values
(such as 3:2 Cycles per Beat). Simultaneously pressing
Up and Tempo will toggle these display options.
P Width determines the proportion of each switch cycle during
which the switch is on. For example, setting P Width to
50% means that the switch is on for one-half of a cycle.
Mode determines the "shape" of the switch output. Three set-
tings are available: Off, Switch, and Ramp. Off turns the
switch off (and frees up processor time). To optimize real
time response, set switch to Off when it is not being used.
When Switch is selected, the transition from on to off is
instantaneous, i.e. the switch output resembles a pulse
wave. When Ramp is selected, the transition from on to off
is continuous, i.e. the switch output resembles a triangle or
sawtooth wave.
T Lvl sets the threshold value at which the switch will begin to
cycle.
T Src selects a patch source to drive the switch. The output of the
switch is 0 as long as T Src is set to a value below T Lvl.
Once the source value reaches or passes T Lvl, the switch
will begin to cycle between on (127) and off (0) at the speed
set by Rate.
Note that both Rate and P Width are available as patch
Destinations, allowing them to be dynamically controlled
by other patch sources. Switches are reset to the begin-
ning of their cycles whenever Tap is pressed.
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