An audio expander
is the complement to a compressor
, in that it expands the dynamic range
of a performance.
Usually applied to a single instrument
, or sub-mix
, the expander contains a VCA
which is controlled by the level of the input
. As the level
of the input raises, the amplifier is turned higher; as the level drops, the amplification is lowered. The speed of attack
, and the extent
of the amplification (called slope
) are typically controllable.
effect of the device is to pass the input
with a disproportionate
effect on the level. Loud
sounds come out very loud, and quiet
sounds very quiet. It may be applied to a particulary non-expressive
voice to add interest.