Toccata needs to use CPU to transfer data to tiny 1K buffer (It is not DMA), not using fastest possible mode can explain the glitches. Approximate mode only sort of works in unexpanded 68000 and 68020 modes.
Unfortunately there is no DMA capable sound cards except few PCI sound cards. (That can only work with G-REX because it is the only PCI bridgeboard that supports PCI DMA, other boards can also support it in emulation but obviously there is no DMA capable drivers..)
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