The four available parts are turned on and off by
the [R1], [R2], [L1], and [L2] buttons. The indica-
tors next to each of these buttons tell you which
parts are on and which are off, and therefore indi-
cate the current orchestration mode. The [EDIT]
button determines which of the four orchestration
parts is to be edited. You can, for example, assign
any of the PSR-410’s 128 voices to each of the or-
chestration parts. But before we discuss voice as-
signment and editing, let’s take a look at the various
orchestration modes