User`s guide

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The Limiter Setup preset has one control, the Limiter Threshold.
This control affects the level (at the output of the effect) at which
the limiter will reduce the gain in an effort to avoid clipping.
The Limiter Threshold defaults to 70%, which is roughly -3 dB. This
means that signals louder than that level will trigger the Limiter and
begin gently lowering the output gain.
The ideal setting of the Limiter Threshold is a tradeoff. If you were
to create a preset that does nothing but pass the input signal to the
output, a full-scale input signal would encounter some limiting if
the Limiter Threshold were set to a value less than 100%. To avoid
this, all the factory presets have been painstakingly tuned to allow a
full-scale signal to pass through without limiting.
If the Limiter Threshold is set to 100%, it will have no effect when
used in many host programs, such as audio editors, which
automatically clip the output at 100% regardless. If you are using a
sequencer or other program which chains multiple plug-ins,
provides a floating-point gain structure and limits or clips the signal
only at the final output, you can consider raising the Limiter
Threshold. However, in all cases, we recommend leaving the Limiter
Threshold at its default setting.
Note that, unlike all other presets, the Limiter Setup preset
remembers its slider setting throughout your session even in the
Audio Unit version. Normally, reselecting a preset in Audio Unit will
reload the factory settings. The Limiter Setup preset, however,
remembers how you set the Limiter Threshold for the duration of
your current session. The next time you reinstantiate SFX Machine
Pro, it will set the Limiter Threshold back to the factory setting.