Apple Logic Express 7 - Manual (Page 170)

170 Chapter 5 The Environment
The letter in parentheses next to the bank number allows you to control the order of
transmission, when a bank select requires more than one message.
As an example:
Here, the Bank Select command “Bank 1” was set up to send three events: first, (a) a
controller #32 message with a value of 1, then (b) a controller #0 message with a value
of 0 and finally, (c) a SysEx message.
If there are no events defined for a particular bank, a standard Bank Select message will
be sent for that bank.
The custom bank select information becomes part of the instrument, and will be
automatically copied with it, should you replicate the instrument Object.
For bank messages that need a channel (MIDI controller messages, for example), the
channel of the instrument is used. This feature is especially useful for multi-instruments,
as you only need to create one set of bank messages for all 16 sub-channels. If an
instrument’s channel is set to All, channel 1 is used.
On multi-instruments, the bank select message (whether it’s a standard controller or a
string of events you’ve configured) is also used by SoundDiver, if Autolink is switched
on. This enables it to request the program names in the current bank.
Mapped Instrument
This instrument is particularly useful for drum instruments or any drum-mode MIDI
device.
A drum-mode device is one which assigns different sounds to different MIDI notes on
the same MIDI channel. Any input note may be routed to a different output note and
assigned its own velocity setting, notation, name, and output cable. You can also
protect mapped instruments from being accidentally transposed.
To create a new mapped instrument, select New > Mapped Instrument.