Yamaha MU90R Owner's Manual page 111

EFFECT EDIT MODE
NOTE
When "NO EFFECT" is selected, Reverb is off and none of the other Reverb parameters are
available (with the exception of the Reverb Pan parameter).
HINT
Generally when using Reverb, you can simply select the particular Type needed, and use it
without bothering to adjust the other parameters. If fine tuning of the Reverb sound is neces-
sary, delve into the other parameters as needed.
Reverb Pan (RevPan)
102
This determines the Reverb Type. Each Reverb Type has different
values for the rest of the Reverb parameters; for example, Basement
has a Reverb Time of 0.6 seconds, while Canyon has a Reverb Time
of 12.0 seconds.
This determines the Pan position of the Reverb sound, or where it
appears in the stereo image.
For details on the parameters for each Reverb Type, refer to the
separate SOUND LIST & MIDI DATA booklet.