Boss JamStation JS-5 Owner's Manual page 30

Let's Try Playing Some Sounds
Using As a Rhythm Machine
A song's performance pattern is played using these four parts: "Inst
(instrument) 1," "Inst (instrument) 2," "Drum," and "Bass."
By playing just the drum part of a song, you can use the JS-5 as a rhythm
machine.
fig.QS02-19
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Press the [PART MUTE] [BASS], [INST 1], and [INST 2]
buttons to make the button lights go dark.
When a button is not lighted, its corresponding part is muted out (silent).
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