Owner manual

The front panel HUSH Threshold control determines the minimum input level at which the HUSH filter

and downward expander will begin to operate. Setting this control too high will result in a loss of sustain, as

notes will tend to die out much faster than they should. Conversely, when set too low, the expander will close

too late (if at all) and the noise floor will remain audible

Gate Section

The other half of the HUSH Pro consists of a noise gate. A noise gate completely shuts off the output

signal when the input signal level drops below a prescribed threshold level (volume). On the HUSH Pro, this

threshold is determined by the Gate Threshold control on the front panel. This control should be set so that it

doesn't cut notes off (i.e., set too high), yet doesn't activate long after a note ends (allowing the noise floor

to remain audible).

This circuit is combined with the Variable Integrated Release (V.I.R.) circuit to provide an internal

variable release to the downward expander. With the V.I.R. circuit, if the guitar signal decays slowly, the

downward expander will engage slowly. If the guitar signal stops quickly, the downward expander will en

gage quickly. The LED indicates when downward expansion is active.