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8.1 Setting up Sound
Manager Support
(for use with
ProTools Free and Other MacOS
Applications)
The Macintosh Sound Manager is a
standard 2-channel software interface for
playing and recording sound on a Mac. The
audio inputs and outputs (speakers) that are
built into any Macintosh use the Sound
Manager interface, and essentially every
Mac application that uses sound supports it.
This includes not only audio recording and
editing programs, but also games, video
editors, web browsers, MP3 players, and
even Macintosh beeps and system sounds.
Even some audio-oriented program only
support Sound Manager I/O, such as
Digidesign’s Pro Tools Free. The Sound
Manager input and output sources are
selected by control panels. The control
panels used are different in MacOS 8.6 and
9.0, and are explained separately below.
MacOS 9.0
The “Sound” control panel in MacOS 9.0 is
used to select Sound Manager inputs and
outputs. With this control panel active, click
on the left of the window where it says
“Output” to display the possible Sound
Manager output devices. On the right, click
on “US-224” to select it as the Sound
Manager output. The US-224 has its own
output volume controls, so the output
volume slider can only be able to mute or
enable sound output. Moving the volume
slider to the right or clicking on it will send a
system beep out the US-224 outputs.
When you click “Input” on the left, the
available input devices appear on the right.
Click on “US-224” to select it as the Sound
Manager input device. Below it is “Input
Source”: select A:B.
When an application is using the Sound
Manager inputs, this “Input Source” field is
grayed out, displaying the current inputs but
preventing you from changing them here.
You can still change the input pair without
quitting your program, however. To do this,
bring up the US-224 control panel and go to
the System tab. You will find a selection
there labeled “Sound Manager Input.” Here
you can change the input pair at any time,
even when an audio program is active. The
grayed out “Input Source” field in the
“Sound” control panel “Input” section will
display any input changes you make.
MacOS 8.6
The “Monitors and Sound” control panel in
MacOS 8.6 has a “Sound” section. It
displays the currently selected Sound
Manager output and lets you select among
several “Built In” input sources. It cannot be
used to select the US-224 as the Sound
Manger input or output.
The “Sound” control panel has a selection
line at the top to let you choose among
“Alert Sound,” “Sound In,” “Sound Out,” and
“Volume” windows. (Note: If your “Sound”
control panel does not have all these
options, you should use the alternate
“Sound” control panel found in Apple
Extras/Sound Control Panel.) With “Output”
selected, you can choose “US-224” as the
Sound Manager output. Since the US-224
has its own output volume control, its slider