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Virtual Outputs

Most audio cards with a pair of analog outputs will appear to software as

having just that, a single pair of outputs. When one application appropriates

the card for its use, all other software is “locked-out” from using the card at

the same time.

Quite often, musicians find it useful to play back from multiple applications

simultaneously. A good example would be playing back digital audio while

at the same time using a software synthesizer for MIDI. Another example

would be using multi-track editing software. Before multiple tracks can be

played back on a stereo device, they must be mixed down within the

software to the two output tracks. This takes up extra CPU cycles that might

otherwise be dedicated to software effects or some other task.

Your Indigo product gets around this by combining the use of “virtual”

outputs with its “multi-client” drivers. Indigo, Indigo io, and Indigo dj

appear to software as if they have eight separate outputs. These are mixed

together with the on-board DSP to produce the actual or “physical” outputs

that connect to external equipment without any CPU intervention. Any

virtual output can be sent to any actual output along with any combination of

other virtual outputs. The levels and routing of the virtual outputs are fully

controllable with the Console, which is described later in this manual.

An example of this would be using Tascam’s GigaStudio with Cakewalk’s

SONAR. GigaStudio could be set up to play back through Indigo’s outputs

7 & 8. SONAR, which combines MIDI sequencing with digital playback,

could then play back its MIDI output through GigaStudio while using

Indigo’s outputs 1 through 6 for six separate tracks of digital output.

This gives your Indigo product most of the advantages of products with

eight separate analog outputs, without the added expense of the extra

converters or having to use an external mixer to mix the outputs down to a

final pair of stereo outputs.

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Echo Audio Indigo io Bedienungshandbuch Seite 11