Input Path selectors determine the source input for audio, Auxiliary Input, and (optionally) Instrument tracks. Track inputs can be set from hardware inputs or internal bus paths or subpaths. For detailed information on assigning track inputs, see Assigning Audio Inputs.Hardware input and bus paths can be configured in the I/O Setup. For more information, see I/O Setup.You can also define what physical ports are routed to Pro Tools input ports in the Hardware Setup dialog. For more information, see Configuring Pro Tools System Settings.