Manual

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The Axe-Fx II Looper is a dedicated effect block (in the Ultra it's a mode within the Delay block). Through firmware updates its features have been expanded considerably. It's possible to select Half Time, Undo, Threshold, Quantize, and choose between Mono / Stereo. Note that you can record with Half Time switched on, and then turn it off during playback for very fast riffing.

You can decide how to put the available looper memory to best use. Possible modes:
- Mono - 60 seconds
- Stereo - 30 seconds
- Mono with Undo - 30 seconds
- Stereo with Undo - 15 seconds

With Threshold switched on, recording will not start until the input level passes the specified threshold, set by the Threshold Level parameter. If you press record, you will see the indicator come on and then turn off. This means it is waiting for input to start recording. Once you start playing you'll see the indicator come on and you are recording.

Quantize will automatically chop your recording to the nearest 1/4 note tempo click. Recommended to use in conjunction with Threshold. Press Record, then start playing on a downbeat click. Press Record again to stop. If you stop slightly too soon or late it will automatically trim the recording to the length. Also, it will automatically start playback on the downbeat. So if you stop playback and start it up again later, it should always come back in on the beat.

Undo will remove the most recently recorded stack layer. If you're not in a mode with Undo, it doesn't do anything.
Note that Undo requires CPU cycles during a brief moment. When used with presets with high CPU utilization, this can result in warnings or audible pops.

Go to I/O > Ctrl to assign the looper controls (such as Play and Record) to floorcontroller switches. Some functionality requires a latching switch, for other stuff a momentary switch is required. A walkthrough for the MFC-101 is here.

The loop buffer will be erased upon presets switches, unless Spillover is enabled. If the preset you're switching to also has a Looper in loop mode, you can continue to control the looper.

Use the Looper to dialing in amp tones. Place it before before the Amp block, and record a "unamped" guitar tone. Now keep playing it back while adjusting amp settings. You'll hear the differences in real time. Alternatively, use it to compare two sounds. Place it after the Amp block and record. Start tweaking. When you want to hear the original tone, play back the sample.

The MFC-101 (firmware 2.11 and later) has a Looper Control Mode. This mode is enabled by pressing and holding the Reveal switch on the MFC-101. In Edit > Setup you can select if this requires short or long pressing-and-holding. You can also disable Looper Control Mode altogether.