Alesis ModFX Metavox Specifications download pdf (Page 31)

Using the Metavox

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.

OI 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 .

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Alesis ModFX Metavox Specifications Page 31