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I misspoke, the left channel was louder, not quieter. This video shows how to set up a Mayak - 233 stereo cassette deck, without measuring instruments. All you need is a cassette with a recording at 400 Hz - 0 decibels, a Steinberg UR22-Mk II sound card, and the following programs: Blue Cat - Patchwork, Voxengo - Span Plus, iZotope - Insight 2.