System Configuration : I/O Setup : Configuring Busses : Resetting Busses

Resetting Busses
You can reset the number of available internal mix busses in your session to match your system’s full capabilities by reverting to the default bus configuration.
Pro Tools creates 128 (out of 256 possible) internal busses by default.
To revert to the default bus configuration for your system:
1 Open the I/O Setup.
2 Click the Bus tab in the upper left.
3 From the pop-up menu to the right of the Default button, select one of the following:
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4 Click Default.
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Resetting busses to the default setting will rename all busses to their default name (Bus 1–2, Bus 3–4, and so on).
5 Click OK to save changes and close the I/O Setup.
Active Busses
The Bus page of the I/O Setup displays the number of active internal mix busses. If the number of active busses exceeds the number of available busses (256), the display turns red. Delete or deactivate any active busses in excess of the available number of busses to be able close the I/O Setup and save your settings.