3-21
Algorithms and Parameters
PCM 81
left channel glide delay feedback input. The range of these
parameters is from +100% down to 1% (Phase Normal feedback),
0% (off), -1% up to –100% (Phase Inverted feedback).
LEVELS
In each algorithm, the Levels row contains parameters for the
phase and level of each voice, as well as a master level parameter
for all voices.
Master
The Master Level controls the overall level in effects which have
more than one voice. This permits simultaneous changes in all
voice levels without altering the balance between individual voices.
In the Res1>Plate and Res2>Plate algorithms, the Master parame-
ter contains two master parameters for the six resonator voices:
Mstr Lvl and Mstr Fbk. (Load/✱ will toggle between them.) Mstr Lvl
is a master level control for all of the resonator voices, as described
above. Use care when adjusting this value. The resonators will put
out high levels if the input source has any components that are
close in pitch to the resonator tunings. In general, this control
should be set to 0dB or less.
The Mstr Fbk control allows the feedback levels for all voices to be
scaled over a range of 0-100%.
Voices
Individual controls are provided for each Voice Level. Voices can be
turned completely off, full on, or set to any point between, in 1dB
increments. There are as many voice level controls as there are
voices in an effect.
In the Res1>Plate and Res2>Plate algorithms, positions 1-6 contain
both level and feedback parameters for each of the six resonator
voices. (Load/✱ will toggle between them.) Lvl controls the
individual level and polarity for each voice. Voices can be turned
completely off, full on, or set to any point in between in 1dB
increments. Use care when adjusting this value. The resonators will
put out high levels if the input source has any components that are
close in pitch to the resonator tunings. In general, this control
should be set to a value less than Full.
The Fbk controls set the feedback level and polarity of each voice.
Voices 1-3 Fbk control the feedback levels from the left channel
delay voice outputs to the left channel delay voice inputs. Voices
4-6 Fbk control the feedback levels from the right channel delay
voice outputs to the right channel delay voice inputs. The sum of
the values for either side should be less than 100%. (Disregard the
negative sign when adding values.)
MODULATION
The Modulation row, which is the same for every algorithm,
contains the parameters for the PCM 81's internal modulation
sources. Use the Patch row to assign these modulators to any PCM
81 effect parameter.
Mod: LFO
Four parameters are available: Shape, P Width, Depth, and Rate.
• Shape Allows you to select the wave shape that will
be used when "LFO" is selected as a patch
Source. The choices are: Sine, Cosine, Square,
Sawtooth, Pulse, and Triangle.
. . . continued on page 3-22
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