USB

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The Axe-Fx II connects to a computer via USB. Pages 22-24 of the manual describe requirements, installation and capabilities.

USB support is Audio Class 2.0 compliant. There's support for:

• Editing and remote control via Axe-Edit (no MIDI interface required).
• Audio communication (no audio interface required, except when using analog audio).
• Use as an exclusive USB-to-MIDI interface for other products (in I/O > MIDI set USB ADAPTER MODE to ON).

Editing and recording can be done simultaneously.

Drivers for Mac and PC which add USB support are available for download here. Note: ignore the options in the driver's control panel. Source

Notes on USB communication:

• When monitoring audio via the Axe-Fx II there's no latency.
• When monitoring the audio signal via the computer's output, latency is determined by the computer's capabilities. Source
• High-pitched noise may be caused by a ground loop. Cliff: "The USB spec calls for grounding the cable at both ends (mistake). This can create a ground loop. Make sure everything is plugged into the same outlet strip." Source
• If you're recording with the use of an application which uses the system selected input (all 4 channels), you will end up with a recording that also contains the dry tracks. The Axe-Fx II currently doesn't let you mute the dry tracks. Source
• The Axe-Fx II cannot connect to a USB stick. Source
• In a DAW the Axe-Fx II appears as a 4-In, 2-Out device.