Metronome question

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Ok...here's a question for you.

I want to have the metronome sound on any preset that I have a loop assigned to. That's the easy part.

 

The hard part (so far) is getting the metronome to shut off when I switch to a preset that doesn't have a loop assigned to it. It stays on the previous presets loop, hence the metronome is still going.

 

I can get around this by creating an empty loop with the metronome off and assign it to that preset, but this seems a bit silly and wasteful of a whole loop slot.

 

I've been all through the manual, but so far no luck. What am I missing?

 

Thanks as always!

Jeremy