M-AUDIO USB - Manual (Page 12)

Operating Mode
In this drop down menu you can select how the Transit USB sends and/or receives audio.The
following options are available:
• 2-In/2-Out, 16-bit, 8000 – 48000 Hz • 2-In/2-Out, 24-bit, 8000 – 48000 Hz
• 2-In/0-Out, 24-bit, 88200 – 96000 Hz • 0-In/2-Out, 24-bit, 88200 – 96000 Hz
• Dolby Digital / DTS pass-through, 16-bit, 48000 Hz
Note: Due to USB 1.1 bandwidth limitations and hardware constraints, sampling rates above
48000 Hz do not support full duplex (i.e., simultaneous input and output) mode.
Latency
Latency is defined as the time it takes for your input signal to pass through your audio
software and appear at the outputs. Smaller buffer sizes result in lower latency, but may not
function well with slower systems. This drop-down menu selects the buffer size Transit USB
uses to handle digital audio streaming.
The default Latency setting is “Medium.” This setting may adequately serve your purposes, but
if you wish to, you can experiment with lower settings. If you experience stuttering or
crackling in your audio playback, try using a higher latency setting.
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output can be connected to powered speakers, headphones or to the analog inputs of your
home stereo system, using a 1/8”-to-RCA adapter.
The Transit USB also has an optical digital output, sometimes referred to as a TOSLink or
Lightpipe connector. You may connect this digital output to the optical digital inputs of a
home theater or stereo, CD-R or MiniDisc recorder, or any device that supports a two-
channel optical digital input.When outputting a two-channel signal, the signal at Transit USB’s
analog and digital outputs is identical.
NOTE: If you need to connect to a device with coaxial S/PDIF inputs, you may purchase
the Co2 Coaxial/Optical Bi-directional Converter from M-Audio for this purpose.
This optical digital output can also transmit a multichannel encoded digital audio signal from
a Dolby Digital or DTS-equipped source. Transit USB’s digital output supports 16-bit AC-3
encoded signals. Note that when “Dolby Digital / DTS pass-through, 16-bit, 48000 Hz” is
selected from the Transit USB Control Panel,Transit USB’s analog outputs are defeated. (See
the next section for more information.)
Input Connections
Your Transit USB is equipped with a unique combination optical/analog input which can
accept a standard 1/8” stereo analog input at either Mic or Line level. This input can also
accept an optical digital input, via the included TOSLink-to-mini optical adapter.Transit USB’s
input jack automatically detects whether the input is analog or digital.
Transit USB’s input can also supply +5V bias voltage to power an electret condenser
microphone such as those supplied with some computer audio products.
Transit USB’s Control Panel
In Windows, you can open the Transit USB’s control panel by double clicking on the M-Audio
icon in the system tray. On the Mac, select Control Panels under the Apple menu, and locate
the Transit USB control panel selection.
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