Yamaha MU50 Owner's Manual page 73

MULTI MODE
Resonance
Alternate Group (AlterGroup)
HINT
The main use for this parameter is in creating realistic hi-hat sounds. By assigning an open
hi-hat and a closed hi-hat to the same group, you can "choke" or stop the open hi-hat sound
by simply playing the closed hi-hat — just like pressing the pedal on an actual hi-hat set.
Receive Note On (RcvNoteOn)
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This determines the amount of filter resonance or emphasis of the
Cutoff Frequency parameter above. Higher values increase the em-
phasis of the Cutoff Frequency, producing a higher resonant peak,
while lower values produce a relatively flat response.
Lower
Resonance
Higher
Resonance
This determines the group assignment of the selected drum sound.
Drums assigned to the same group cannot be sounded simultane-
ously. In other words, if one drum in a group is sounding while a
second in the same group is played, the first drum sound will be cut
off and the second will sound.
This determines how the selected drum sound responds to MIDI
Note On messages. Normally, this should be set to on so that the
corresponding drum sound plays when a MIDI Note On message is
received. Set this to off when you want to keep the selected drum
sound from playing.
Resonant Peak
Cutoff Frequency