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There is no "double speed" mode. DMA is still as fast (or slow) as previously.
Audio supports higher sample rates only because doublescan modes have halved horizontal scanline time (instead of standard 227 DMA slots, there is only about 120 slots or so, depends on mode) and all DMA in Amiga (except copper and blitter) is synced to scanlines, audio for example is 2 8-bit samples per channel per scanline. (same sample pair is repeated if rate is larger than DMA handle)
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