Yamaha AR-100 - Manual (Page 71)

65 5. Styles (Rhythm and Accompaniment)
2.
Select the User mode with the appropriate Data Control button.
3.
Select the ASSIGN page by pressing the appropriate Menu button.
ASSIGN Page
4.
Select the desired instrument category (Cymbal/Hi-Hat, Snare Drum, etc.)
by pressing the appropriate Menu button.
5.
To assign an instrument to a particular key or pedal, simultaneously hold
down the Data Control button corresponding to the desired instrument
and press the upper/lower key (or pedal) to which the instrument is to be
assigned.
Continue assigning additional sounds to the other keys as required.
PAGE
Instrument categories
Clears all assignments (See page 66).
Individual instrument sounds