What are the uses of the 512 KB DRAM on the SB AWE32?
The on-board 512 KB of memory is used to hold user samples. In GS synthesizer mode, this 512 KB is used to hold the sound effects of GS. In GM synthesizer mode, the 512 KB DRAM is free, so it can hold SoundFont banks containing samples. MT-32 Synthesizer mode uses a small portion of the 512 KB of memory, therefore you can still load your own SoundFont bank samples into the rest of the free RAM space.