M-AUDIO Duo USB - Manual (Page 22)

With both stereo pairs enabled, i.e., Input 1&2 and Output 1&2, the Duo behaves
as a “2x2” audio device at 16- or 24-bits, and at sample rates of 48kHz and below
(that is, 48kHz or 44.1kHz). These two sampling rate options as well as bit
depths will be selectable from within your music program.
Clicking on any one of the active channel boxes and disabling that channel pair (in
this example, we have disabled Output 1&2) will free-up some of the USB
bandwidth. As a result, the Maximum Sample Rate readout will change to 96000 Hz.
The Duo will perform at 96kHz sampling rate with any one of the stereo pairs
enabled, and with either the 16- or 24-bit Sample Depth selected. The Duo will
operate at 96kHz when the control panel is set to 16-bits, though this is not a
likely choice for 96kHz recording (it’s sort of the digital audio equivalent to
wearing sneakers with a tuxedo). With one Active Channel enabled and at the
24-bit setting, sample rates of 96k, 88.2k, 48k and 44.1k, as well as bit depths of
24-bit and below, will be selectable from within your music program.
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