depends on how far you wana go.

if you want simple and compact, there is the boss rc-2 and there is 2 or 3 more that are more that get more complecated from there but are packed full of features.
The Stereo Memory Man with Hazarai has a good loop fuction, as does the Empress Effects Superdelay. However, the ZVex Lo-Fi Loop Junky is pretty damn amazing, i'd look into one of those.
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