3-23
Algorithms and Parameters
PCM 81
• Repeat As long as the threshold source remains at or
above T Lvl, the envelope cycles from attack to
release. If A=R, the output of the envelope is a
triangle wave.
• One Shot Once T Lvl is reached, the envelope will go
through its entire attack cycle. Once the attack
cycle is completed, if Source value is below T
Lvl, the envelope will immediately fall at the
specified Release rate. The envelope will go
through its entire release cycle, even if the
source subsequently rises above T Lvl. If the
Source value is at or above T Lvl, the envelope
will remain at 127 until the T Src falls.
• Retrigger As long as the level is at or above T Lvl, the
envelope will go through its attack cycle. If the
level falls below T Lvl before attack is
completed, the envelope immediately begins
to release.Likewise, if the T Lvl is crossed again
before the release is completed, the attack
cycle will begin again.
•Off This control turns the AR envelope off (and
frees up processor time). To optimize PCM 81
real-time response, set AR Env to Off when it is
not being used.
Mod: Env L and Mod: Env R
These are left and right input signal envelope followers. The only
available parameter is Release which is set in milliseconds. This
control allows you to specify the release rate (0-10 seconds) when
the input level drops.
Mod: Latch
The latch is a very flexible modulation source. It can be used to do
such things as derive a switch from a continuous “return to zero”
source (like MIDI After Touch). It can turn a momentary (on/off)
footswitch into a latching footswitch (push on/ push off), and it
can divide the switching rates of sources in half or thirds.
The latch has three parameters: Src, High and Low. Any patch
source can be the Src (See Source listing under Patching.) High and
Low are threshold values. The latch works as follows:
High
Low
127
0
With High set to 127, and Low set to 0,
no latching will occur. The output is
identical to the output of the selected source.
High
Low
127
0
With High set to less than 127, and Low
set to 0, the High value will be latched.
High
Low
127
0
With High set to 127, and Low set to a value
greater than 0, the Low value will be latched.
High
Low
127
0
With High set to less than 127, and
Low set to a value greater than 0,
both values are latched.
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