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Two halves of the same computation disagreed once TUSB_SPEED_SUPER existed. frame_div and k already resolve SUPER to the microframe form by testing "== TUSB_SPEED_FULL", but the fifo_count rate constants and the feedback interval tested "== TUSB_SPEED_HIGH", so at SuperSpeed the constants stayed 8x too large and tud_audio_feedback_interval_isr() fired 8x too rarely. Latent today - no DCD serves SuperSpeed isochronous yet - but it is shared class code.