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USB 1.1 and Audio: Sample Rate / Bit Depth related bandwidth limitations
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Q: I've heard that because of the limited bandwidth of the USB 1.1 bus, there are limitations to how many audio inputs- and/or outputs can be used with the different Sample Rates/Bit Depths. What exactly are those limitations.

A:
- 2 Inputs and 0 Outputs at 24Bit / 96kHz
- 0 Inputs and 2 Outputs at 24Bit / 96kHz
- 4 Inputs and 2 Outputs at 24Bit / 44.1 or 48kHz
- 2 Inputs and 4 Outputs at 24Bit / 44.1 or 48kHz
- 4 Inputs and 4 Outputs at 16Bit / 44.1 or 48kHz
- 2 Inputs and 8 Outputs at 16Bit / 44.1 or 48kHz (Sonica Theater)
- 4 Inputs and 4 Outputs with every other sample rate up to 16Bit/44.1kHz.

This information applies to recording/playback through separate physical Inputs and/or Outputs. Of course you can't get more inputs or outputs than physically present on your USB Audio device. Playing multiple audio tracks that are mixed down within a software application and being output through the available physical audio outputs on the M-Audio USB audio device is always possible (e.g. playing a virtually unlimited amount of audio tracks within a software application, played through the outputs 1+2 on the USB audio device). Some M-Audio USB audio devices do not support all listed Sample Rates and/or Bit Depths