With all four stereo pairs enabled, i.e., Inputs 1&2, 3&4 and Outputs 1&2, 3&4,
the Quattro behaves as a “4x4” audio device at 16-bits, and at sample rates of
48kHz and below (that is, 48kHz or 44.1kHz). These two sampling rate options
as well as bit depth will be selectable from within your music program.
Clicking on any one of the active channel boxes and disabling that channel (in
this example, we have disabled Output 3&4) will free-up some of the USB
bandwidth. As a result, the 24-bit setting in the Sample Depth column will now
be accessible and consequently is no longer grayed out. The maximum sample
rate is still 48000 Hz.
With any combination of three stereo pairs enabled, the Quattro will function
either as a 2x4 or a 4x2 audio device, with one input and two output pairs or two
input and one output pair, respectively. In this mode, the Quattro is capable of
48kHz or 44.1kHz at either 24- or 16-bits, as set by the music program. Note that
when the 24-bit option is selected in the Quattro control panel, the input or output
stereo pair that is currently disabled will become grayed out.
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