The Synth Strings, Sweep, and Halo instruments for example sound nowhere near as good as they do on the hardware. Additionally, I think gm.dls's synth and pad instruments sound extremely dull compared to most other SoundFonts (and especially the SC-55). For example, the 'DOOM' voice heard in the intro to DOOM II MAP05's music does not play correctly with gm.dls. Gm.dls's samples are noticeably lower quality than the real SC-55's, and some instruments sound completely different.
