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NOTE: Macintosh Sound Manager protocol only supports two channels of 16-bit audio at 44.1kHz sampling rate.
Hence, when working with Macintosh Sound Manager, the OmniStudio USB functions as a 2 in, 2 out device only. To
use the OmniStudio USB in MacOS 9 as a four in, four out device, or at other bit depths and/or sampling rates, your
audio software must support ASIO. Under MacOS X, the OmniStudio USB is supported by Apple's CoreAudio protocol
as a four in, four out device.
Inputs and Outputs
The OmniStudio USB provides up to four audio inputs, seen by the host audio application as two stereo pairs, i.e. 1/2 and 3/4. The
OmniStudio USB also provides up to four audio outputs, also seen as stereo pairs. The outputs are routed to the internal mixer's stereo
bus, appearing at the Monitor Output, Main Output and Headphone Outputs. They can also be routed to Direct Outputs 1 through 4,
and can be sent individually to the FX Send output.
When all four stereo pairs (two input pairs and two output pairs) are enabled, the OmniStudio USB will operate at 48KHz sampling rate
or lower, in 16-bit mode. When any three stereo pairs are enabled (i.e., either one input pair and two output pairs, or two input pairs
and one output pair), the OmniStudio USB will
enabled (a single input or output pair only), the OmniStudio USB will operate at 96kHz sampling rate or lower, and in 24-bit mode.
For more detailed information, refer to Section 10, "Using the Control Panel."
The OmniStudio USB also adds 1x1 MIDI operation (one input and one output port) to your USB equipped PC computer; this can be used
as your only MIDI interface or in conjunction with additional MIDI interfaces.
I/O Levels
The OmniStudio USB's Line Inputs (3 and 4), and its outputs 1/2 and 3/4, can be configured for +4 or -10 line level input simply by
pressing their associated rear panel level selection switches. This allows for seamless integration with professional balanced (balanced
TRS, +4dBu) or semi-pro (unbalanced TS, -10dBV) audio devices (see Section 11, "Using the Input andOutput Level Switches").
operate at 48kHz sampling rate or lower, in 24-bit mode. When one stereo pair is
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