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Don't tell my kids, but there was a time when I didn't know if the record was turning correctly or backwrds. Anyway, either a ton of cement or about 8 inches of foam under the base and a plastic top tamed most of feedback from floor and whatever back in the day. Had ears good then and decent vinyl stuff that we liked too.

Some of Bach's stuff sounds pretty good backwards too. Try recording a segment from a synth in MIDI and invert it, even if you are not a maestro. No samples to offer, haven't done it for a long time, but I was surprised.