Alesis NanoPiano Reference Manual page 95

Piano & Vox
PLEASE NOTE: It's possible to get confused here, if you don't
pay attention, by the interaction of the CATEGORY knob and
incoming MIDI Program Change commands.
First, when you send Bank Select and Program Change
commands, the front panel knobs don't move. This means that
you could easily be playing ACOUSTIC PIANO 1 via MIDI, say,
while the two knobs point toward EFFECT 12. Don't be fooled.
Secondly, the latest Bank Select command that the NanoPiano
receives, either from its front panel or over MIDI, is what it pays
attention to. For an example of this, consider the following
situation. Using MIDI, you select Bank 1 and a certain program
you like. Then someone comes along (while you aren't looking)
and turns the CATEGORY knob to one of the Bank 2 categories.
Now Bank 2 is selected, and if all you send the NanoPiano is a
Program Change command (instead of a Bank Select followed
by a Program Change) you won't get the program you wanted.
Instead, you'll get the same-numbered program in Bank 2.
TIP: Because of this, I suggest that you always send both a
Bank Select command and a Program Change command,
together, when controlling your NanoPiano via MIDI.
CONTROLLER 0 vs. CONTROLLER 32: Some sequencers
automatically use Controller 32 commands for selecting banks
on an instrument. Please be aware that the NanoPiano does not
respond to Controller 32 commands. The only way to select
banks on a NanoPiano via MIDI is to use Controller 0.
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NanoPiano Reference Manual 95