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You need two amps. And you're not clear about whether you're distortion is pedal driven or you are overdriving the amp. That what make a huge difference w/ what you could get away with on one amp. With dirty signals though, you don't want to try and blend them on one amp.... so, two amps is the way to go.
If you want to play the other parts real-time and build on top of them while the original signal loops, you can run your guitar through a A/B switcher.... switch between the signal to looper/amp and the alternate amp.
I'd recommend nothing other than the Electro Harmonic 2880. I've had and played them all and this one is the titty's. The Boss RC-2 is your best bet for value. You could probably pick one up cheap off eBay.
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