I mentioned this over on Facebook but for anyone not over there, I highly recommend checking out the technique used on the mixer in this patch, as it can be employed in many different ways.
MixMaster allows Aux Returns to be routed back to groups, and the groups have their own sends, which means the FX returns can be sent out to FX again - this feature (which I very rarely see get used, so I was very happy to see this!) allows you to add FX to your FX. This enables you to do some relatively straightforward things, like putting reverb on your delay for example, or as in this case, to create more complex, carefully controlled, multiple delay feedback loops. It’s a very powerful technique - be careful when adding reverb to your reverb though as that can get out of hand very quickly!
By default, MixMaster prevents a group sending out to the same effect for which the group’s source is that effect’s aux return (you’ll see a little red LED light up next to the send knob for that effect) - this is a safety feature to prevent harsh feedback loops spiralling out of control - however if you are confident you know what you are doing, you can turn this safety feature off in MixMaster’s global settings.
All feedback loops are done at the users own risk and MindMeld accepts no responsibility for blown speakers or any other fried audio equipment resulting from such overly creative use 