Plug-in Reference

101
MIDI effects
Compressor
This MIDI compressor is used for evening out or expanding
differences in velocity. Though the result is similar to what
you get with the Velocity Compression track parameter, the
Compress plug-in presents the controls in a manner more
like regular audio compressors. The parameters are:
Context Gate
The Context Gate allows for selective triggering/filtering
of MIDI data. It features two modes: in Poly Mode the
Context Gate recognizes certain chords that are played
and in Mono Mode only certain MIDI notes are let through.
These modes can be used for context selective control of
MIDI devices and are, for example, very useful in certain
live scenarios.
The following parameters are available:
Poly Mode – Polyphony Gate
This allows you to filter MIDI according to the number of
pressed keys within a given key range. This can be used
independently or in conjunction with the Chord Gate func-
tion.
• The Key Range Limit sliders are used to set the key
range.
Only notes within this range will be let through.
• The “Minimum Polyphony” value field allows you to spec-
ify the minimum number of notes required to open the gate.
Poly Mode – Chord Gate
When Chord Gate is activated, only notes in recognized
chords are let through.
• Two Recognition modes are available: Simple and Nor-
mal. In Simple mode, all standard chords (major/minor/b5/
dim/sus/maj7 etc.) are recognized, whereas Normal mode
takes more tensions into account.
Parameter Description
Threshold Only notes with velocities above this value will be af-
fected by the compression/expansion.
Ratio This determines the rate of compression applied to the
velocity values above the threshold level. Ratios greater
than 1:1 result in compression (i.e. less difference in ve-
locity) while ratios lower than 1:1 result in expansion (i.e.
greater difference in velocity).
What actually happens is that the part of the velocity
value that is above the threshold value is divided by the
ratio value.
Gain This adds or subtracts a fixed value from the velocities.
Since the maximum range for velocity values is 0–127,
you may need to use the Gain setting to compensate,
keeping the resulting velocities within the range. Typi-
cally, you would use negative Gain settings when ex-
panding and positive Gain settings when compressing.