Guide:Play Count—When Guide:Play Count is set to 1MEAS, a one- measure count-in plays prior to playback when phrase playback is started with the REC/PLAY/OVERDUB pedal. (The OFF setting disables the count-in.) The count-in level is determined by the GUIDE LEVEL knob.

No count-in plays when the RC-50 is started via a MIDI clock command from an external MIDI device, or when individual phrase playback is started with an external pedal or MIDI CC #80 assignment, even if Guide:Play Count is set to 1MEAS.

If you wish to have a longer count-in—or you just want to play along with the guide before committing to phrase recording—set Rec Count and Play Count to OFF, and use GUIDE START/STOP to start the guide sound prior to phrase recording.

Guide:Level—As an alternative to using the GUIDE LEVEL knob, you can set the guide level (or turn the guide off) here.

Guide:Output—Here you can assign the guide sound to either or both of the RC-50’s output pairs (MAIN and/or SUB).

Sounds assigned to the MAIN OUTPUT jacks are sent to the PHONES jack as well.

By assigning the guide sound to a separate output pair from the phrases, you can isolate it for onstage monitoring or recording applications.

The RC-50 has system output settings that allow you to override the settings made in a patch. If the guide output is set in this way, changes made on the Guide:Output screen won’t have any effect. To learn more about system output settings, see the RC-50 Workshop booklet Patches or Page 69 in the RC-50 Owner’s Manual.

About Loop Quantize

The RC-50’s Loop Quantize function helps you close a phrase in time with the guide or another phrase, even if you don’t press the REC/PLAY/OVERDUB pedal at

exactly the right moment. This keeps everything in sync and allows you to focus on your performance rather than precision pedal-pressing.

Loop Quantize is designed to work automatically in the background, so you don’t have to think about it much when it’s on. In most cases, you’ll find it extremely natural and intuitive to use. A little later, we’ll get into the details of how Loop Quantize works in a variety of phrase-recording scenarios. Before that, let’s discuss how it helps you, and investigate what’s going on under the RC-50’s hood when it’s on. But first...

...A Brief Detour into the Conceptual World

After you record a phrase, the RC-50 assigns it a tempo value called the “original tempo.” The RC-50 uses the phrases’ original tempos—in conjunction with the current patch tempo—to carry out its Loop Quantize and Tempo Sync functions.

Patch tempos, phrases’ original tempos, and Tempo Sync are covered in the RC-50 Workshop booklet Tempos and Tempo Sync. We recommend you check it out if you want to learn more about them.

As containers that hold audio recordings, the RC-50’s phrases don’t have any musical properties of their own, per se; any musicality they have is inherited from the audio with which you fill them. Since we don’t actually know what you’re going to record in a phrase, its actual tempo—musically speaking— might be different than the original tempo the RC-50 assigns to it.

That said, when you’re recording while listening to the guide or another phrase, you’re usually going to be performing something that’s rhythmically related to what you’re listening to. In this circumstance, the phrase’s original tempo—as assigned by the RC-50—should match the actual tempo of the audio that’s in the phrase.

Our discussion about Loop Quantize assumes that you’re creating phrases that are rhythmically related to the guide and each other.

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Boss Audio Systems RC50 manual About Loop Quantize, Brief Detour into the Conceptual World