The Fingerlift Note aka release note
This is caused by the strings still vibrating when you lift the finger up from the fret. Because the finger is slightly lower positioned as your fret, the tone will go down.
If the tone goes down more than 50 cents ( a quarter tone), MG will then start a tone a half step down, I call this the “release note”.
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First thing to do is to check the intonation of your guitar: if the note was already low several cents when fretted, the release note is very much likely to be under that 50 cents border.
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if you put your finger nearer to the upper fret, the release note will be higher tuned, and the lower note will not be triggered on release.
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Damp with your right hand. This is what you general see with synth players: they mute the notes with the right hand to have clean note endings, where the note is muted before it is unfretted.
MIDI Velocity
Velocity is a linear gain applied to the scanned note velocities. There is no compression in it.
the Curve knob is straight when it is set at 12’o clock. It compresses when turned to the right, expands to the left.
If you want a gate more severe than the builtin noise gate, you should try the midimachine here: Custom_Gate: A hard midi startgate and retrigger blocker