Dave Smith Instruments Prophet 12 Manual de usuario descargar pdf (Pagina 33)

Prophet 12 Module Operation Manual

High-Pass Filter

After each voice’s low-pass lter, the signal passes through a 2-pole, resonant

analog high-pass lter. There is also a control for modulating the lter cutoff with

the keyboard.

Frequency: 0...127

—Sets the high-pass lter’s cutoff frequency. Frequencies

below the cutoff are attenuated at a slope of 12 dB per octave. Frequencies above

the cutoff pass through the lter unaffected, hence the name “high-pass.”

Resonance: 0...127

—Emphasizes a narrow band of frequencies around the

cutoff frequency. Normally, the high-pass lter does not self oscillate at the

maximum resonance setting. However, it may be driven into self-oscillation by

routing DC modulation to resonance to push it beyond what can be achieved

by the Resonance control alone. Be aware, though, that the signal level of the

self-oscillation is signicantly higher than normal, and will likely cause severe

clipping, especially as more voices are played.

That can be mitigated by turning

down the voltage controlled amplier envelope amount and, if used, the VCA

Velocity



Amount.

Key Amount: 0...127

—Sets the amount of modulation from the note data

received via MIDI to Frequency (the lter’s cutoff frequency). A setting of 64

will step the lter in semitone increments for each note, 32 would be quarter-

tones, and so on.

Note: The high-pass lter does not have a dedicated envelope like the low-

pass does. However, auxiliary envelopes 3 and 4 can be routed directly to

the high-pass lter, and any of the envelopes can be used to modulate the

high-pass using the modulation matrix. See Modulation on page 32 for

more information.

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Dave Smith Instruments Prophet 12 Manual de usuario Pagina 33