Apple Logic Express 7 - Manual (Page 171)

Chapter 5 The Environment 171
A mapped instrument is useful for drum programming. It is used just like a standard
instrument, but has the following special features:
Each individual input note can be:
• named (snare, hi hat and so on);
• mapped to an output note (F# and G# for the same hi-hat sound, allowing you to
play rapid repeats);
• given a velocity offset;
• assigned its own MIDI channel;
• sent to one of up to 16 output cables (this allows you to create a single instrument
that addresses multiple sound sources);
Object Parameter Box
The mapped instrument’s parameters are a subset of the standard instrument (see
“Standard Instrument” on page 163) parameters. The missing settings are available on a
note-by-note basis in the mapped instrument window.
GM Mixer Object
The GM Mixer is a collection of 16 fader “modules”, configured to emulate a virtual
mixing desk for 16 MIDI channels. Each module has controls for volume, mute, preset,
bank, and four assignable knobs (one of which is typically used for pan). There are
optional controls for standard XG and GS effects.
The GM Mixer can be directly connected to an output port, via its Parameter box.
To create a new GM Mixer, select New > GM Mixer.
The GM Mixer is intended for controlling the 16 channels of a MIDI device which
conforms to the GM, XG, or GS standard. This includes the GM set of 128 program
names (with variation banks for XG or GS), MSB/LSB bank select messages, and
standard controller names (#1 for mod wheel, #2 for breath, #7 for volume, #10 for pan,
#11 for expression, and so on).