Chorus; Flange; Delay; Pitch - Alesis MultiMix8FireWire Reference Manual

Digital Effects Processor
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CHORUS

These create the effect of multiple voices (or instruments)
sounding at once from a single input.

FLANGE

These create a sweeping, swooshing sound effect that you will
probably recognize.

DELAY

These effects are based on a discrete repetition or echo of the
input.

PITCH

These effects transpose the pitch of the input signal and blend the
effect signal with the original to create harmonies.
MULTI & MULTI II
These are combinations of two or more of the above effects.
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