I thought that I'd get the - max amount of options this side of buying a dedicated mixing desk, so I bought a Wounded Paw V4 blender... It's got 3 fully buffered loops, 2 with different high pass filters, plus phase, level and 3 different options for which way loops 3 and 4 go, plus it's got a clean blend which can also be used as a 4th loop.
It's the Dog's!