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Algorithms and Parameters
PCM 81
PITCH
The Resonant Chord algorithms: Res1>Plate and Res 2>Plate each
have a Pitch row that contains the parameters for setting and
controlling the tuning of the effect's resonators. Each set of
parameters is presented separately here.
Res 1>Plate Pitch Parameters
The voice resonators take the audio impulse from a delay voice and
“resonate” it at a desired pitch. Until a resonator is assigned a
pitch, it does not resonate. The Res1 effect is a “round robin” pitch
assign in that pitch changes are individually assigned to one of (as
many as) six voice resonators. For example, assume that all six
voice resonators are active in the newly loaded effect, and the first
pitch assigned is A4. Voice 1’s resonator will be set to the A4
frequency. Assign B4, and Voice 2’s resonator will be set to that
pitch. In this example, if we assign four more pitches (D5, G4,
A#:Bb4, C5, for example), they will be assigned to the Voice 3, 4,
5, and 6 resonators, respectively. If a seventh pitch is assigned, for
example, F3, Voice 1’s resonator will be changed from A4 to F3
(the other resonators remain at the last assigned pitches).
Assign
This parameter has a range of C0 to G10 (128 pitches) to be
convenient for MIDI patching. As the value of this parameter is
changed, each “next value” is assigned to the next active pitch
resonator of the six possible active resonators. An example might
be driving this parameter with a slow LFO to achieve an effect
something like strumming the strings of an open piano.
Tuning
This parameter allows you to tune the A440 reference of the box
anywhere from 430.0-450.0Hz in 0.1Hz increments.
Active
This parameter allows you to define the number of active voice
resonators. You can choose from 0 (no resonators active) to 6.
Setting the value to 1 will limit pitch assignments to Voice 1’s
resonator. Setting the value to 2 will limit the round robin pitch
assign to Voices 1 and 2. A value of 6 uses all the voice resonators.
A handy feature of this parameter is the ability to mute resonators.
For example, you can patch this parameter to a footswitch or
pedal, allowing you to drive the parameter value down to 0 at any
time, causing the resonators to stop playing their last assigned
pitches. You can then immediately drive it back up to the desired
number of active resonators. This “clears” the pitch assign for the
resonators, so they don’t go back to playing their previous pitches,
but rather wait for the next pitch assign to come along before
resonating.
Unison
This is a simple On/Off control. When set to On, pitch assigns will
be sent simultaneously to all active resonators. When set to Off,
pitch assigns will operate in the round robin method described
earlier. This allows you to set multiple delay times for all Voices and
allows a single pitch assign (rather than 6 individual assigns) to set
all the resonators to the same pitch. The pitch will ring out at 6
different delay times from the input impulse.
Res 2>Plate Pitch Parameters
The voice resonators take the audio impulse from a delay voice and
“resonate” it at a desired pitch. The Res2 effect is a “interval
harmonization” pitch assign in that pitch changes generate
interval pitches to be assigned to the six voice resonators.
. . . continued on page 3-28
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