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2/ OK, how to dial up a #Dumble? I do it the same way I dial up ANY amp, which begins by listening to just the amp, not the guitar through the amp.

1. Plug in your guitar, turn the guitar volume off.

2. Turn the amp control off, everything all the way down.

3. Get right down next to the speaker.

4. Open up your post effect master 50-75%. Listen to the amp blow through the speaker, anything?

5. Open up the front master a little bit, listen to the blow.

6. Open up the gain to 1