Apple Logic Pro 7 - Manual (Page 222)

222 Chapter 5 The Environment
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).
Most of the GM Mixer’s set up is done in the mixer itself, but there are also a few
parameters in its Parameter box.
Cha/Port
Like other instrument Objects, the GM Mixer can also have a direct MIDI output
connection. This is set in the line below the channel in the Parameter box. The Channel
parameter determines the channel number of the lowest GM Mixer module. You can
use this, together with resizing the GM Mixer window, to create sub-mixers for any
continuous string of channels (3 to 7, for example).
Legend
The Legend checkbox toggles the display of the legend along the left edge of the GM
Mixer. The Legend not only indicates what the rows of controls do, it is used to set the
function of the top four rows of knobs. After the GM Mixer is set up, you can hide the
legend to save space.
Bank
The Bank checkbox toggles bank MSB/LSB display below the program name display, at
the bottom of the GM Mixer. You can save space by hiding bank display, unless you
need to select program banks numerically.
MMC Record Buttons
This Object allows you to control the record enable status of external, MMC (see “MIDI
Machine Control” on page 616) compatible, recording devices. Resizing the Object
allows you to determine the layout and number of track record buttons.
The Parameter box has the following settings:
MMC ID
Set it to “All” (= 127) to control all connected MMC devices, independent of the MMC ID
that is set, or set it to a specific value to control a specific MMC device.