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In page DirectSound:
"Some late DOS-era "wavetable" sound cards such as Sound Blaster AWE32 and Gravis Ultrasound featured dedicated DSPs, which were borrowed from the digital music instruments. These cards featured local memory which could be used for buffering multiple audio streams and mixing them on board, thus offloading the CPU and greatly improving the sound quality. However, this was only possible in DOS by directly programming the hardware, and full-featured "hardware acceleration" from the local memory was never implemented on these cards, due to complexities of double buffering. Later cards such as Sound Blaster Live!, Audigy and X-Fi are capable of accessing the system memory buffers directly.
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