Phreeq; Siblance - Alesis ModFX Metavox Reference Manual

Noise
This mode selects a white noise generator as the sound to be
vocoded by the input. Since white noise has all frequencies at
once, the vocoder's filters will be most noticeable on this setting.
Right In = Synth
Use this mode when you want to vocode any external input—a
polyphonic synthesizer, guitar, etc. When [SYNTHESIS
INPUT] is set to RIGHT IN = SYNTH, the right input will
be the sound that is processed, and the left input (normally a
microphone) will be the sound that controls the amplitude
and tone of the right input. In other words, the right input is
what gets vocoded, and the left input does the vocoding. See page
19 for the typical hookup.

Phreeq

The [PHREEQ] knob sets the frequency or pitch of the Metavox's
internal waveform oscillator, so it has effect only when the
[SYNTHESIS INPUT] switch is set to SAW, RECTIFIED SAW,
or SQUARE. At full-counter clockwise rotation, the frequency is
very low (subsonic). At full clockwise, the oscillator frequency is
in the upper range of a typical keyboard.

Siblance

[SIBILANCE] adds "consonant" sound to the output of the
Metavox if there isn't enough high-frequency information in the
synthesis input (the carrier) itself to allow the higher band-pass
filter envelopes to mimic the effect of consonants in human
speech. Technically, [SIBILANCE] mixes in noise into the high
frequency bands of the Synthesis filters, so when a high-frequency
consonant, fricative, or plosive sound appears in the controlling
input, there will be something for the higher bandpass filters to
pass along to the output in response. If the [SYNTHESIS
INPUT] is set to NOISE, the carrier signal already has enough
high-frequency content to mimic consonants.
Using the Metavox
NOI SE will no t b e a ff ec te d
b y the MOD ULATI ON
c ontr ols (RATE, DEPTH ,
TAP TEMPO etc .) b ec a us e it
isn 't a pitc h ed wav e fo rm .
3
29