Lexicon PCM 80 - REV 1 DUAL FX User Manual page 29

PCM 80 Dual FX User Guide
The Resonant Chord
Algorithms:
Res1 and
2-8
The Resonant Chord effects use impulsive energy at the inputs to excite four
resonant voices (notes). The level, pitch, duration, and high-frequency cutoff of
the overtones for each voice are separately controllable. Each voice can be
Res2 panned independently. The voices resonate to some degree with any input, but
the most effective excitation contains all frequencies, like percussion. Other
instruments may give a quality of tonal ambience in which certain notes rise
ethereally from the background.
The two algorithms differ in the way pitches are assigned to the resonators. In
Res1, pitches are assigned to the four voices chromatically, in a round-robin. If,
for example, MIDI note numbers are used to assign pitch, the resonators will
constantly be re-tuned to the pitches of the last four MIDI notes received. (This
can produce an effect similar to playing a piano with the sustain pedal de-
pressed.) In Res2, pitches are assigned to the four resonators diatonically —
harmonized with the key, scale, and root of your choice. If MIDI note numbers
are used to assign pitch, the resonators will constantly be re-tuned to harmonize
with the incoming notes.
These algorithms can address up to 4 Meg of delay memory (with optional
SIMMs added to the PCM 80), providing 38 seconds of stereo delay.
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