Mac Os X - Tascam US-125M Owner's Manual

4 – Settings
5 Set whether or not the signal output from the computer is returned to the
computer after being mixed with other signals. Set the LOOP MIX switch
according to how you are using the mixer.
ON: Use for live Internet broadcasts, for example.
OFF: Use with an audio application, for example.
Loop mix switch
NOTE
When streaming audio live on the Internet, for example, sounds could loop back
through the computer, causing an echo-like repetition. If this occurs, set the volume
setting in the application that you are using to "0".
Example: Ustream
6 To adjust the output level, use the OUTPUT knob on the front of this interface,
as well as the Volume tab of the computer Sounds and Audio Devices Control
Panel.
This adjusts the output levels of both the LINE OUT and PHONES jacks.
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TASCAM US-125M
Monitor volume level = 0
Set the level of the Device volume to High (maximum).
Do not check Mute.
Then, click OK at the bottom of the window to close it.

Mac OS X

1 Open the Utilities folder, which is inside the Applications folder, and double-click
Audio MIDI Setup to launch it.
2 Depending on the version of OS X that you are using, click the Audio Devices tab
or select Show Audio Window from the Audio Window menu
Mac OS X 10.6.8 and 10.7.1
Input
Control-click USB Audio CODEC if the speaker icon does not already appear by it,
and select Use this device for sound output. Then, control-click USB Audio CODEC if
the microphone icon does not already appear by it, and select Use this device for
sound input.
As necessary, set the Format setting for both Input and Output to the same
sampling frequency and number of channels/bit-rate as the audio application
that you are using.
Output