FX Fighter was the showcase for what was at the time a cutting edge 3-D graphics engine developed at Argonaut that went on to be used in several other successful games.
The main new feature this had in the sound drivers was real time sound decompression algorithms that meant that the sound drivers actually used less CPU power than playing un-compressed 16-bit samples. This was mainly because the decompression routines (assembly language, of course) took virtually no time, yet each sample was ~4 bits of data rather than 16, so ~1/4 less data was being shifted, and as we all know, memory access can be a bigger bottle neck to code execution than the instructions themselves.
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