I have a TNT three and I found the best improvement by far was to go to dental floss. I found the belts to degrade the sound so I would have a tough time understanding how more could be better.
VPI pulleys have different levels (speeds) built into the slight conical shape so it makes zero sense to use more than one belt; they will fight one another with increased friction. I have an Aries 2. I would like to try floss though, that sounds interesting.
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