Alesis ProLinear DSP, Reference Manual

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Using the Software
3
A note about HSH, LSH, and HP
There are three additional settings for the Q parameter that
are found below the value of 0.25: HSH, LSH, and HP. Here’s
what they do:
The LSH (Low Shelf) setting affects everything
below the specified frequency, similar to
conventional tone controls on a home stereo. For
example, if Band 1 is set for Low Shelf and the
frequency is set to 800Hz, everything from 800Hz on
down will be boosted or cut. The following diagram
shows high or low shelving:
HSH (High Shelf) works the opposite way. When
this function is turned on, everything ABOVE the
set frequency will be affected
.
The HP (High Pass) setting turns the Band into a
highpass filter. This button disables the Gain
parameter for the Band. When this setting is in
effect, all audio below the Band frequency setting will
be filtered out at a slope of 6dB per octave. Its basic
function is as a bass frequency rolloff.
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