Thanks, Cloud. Aside from comparing the sound characteristics of the devices themselves, I've discovered some cool demo songs thanks to your samples (like those amazing Adlib Gold ones posted quite some time back).
In this case, I like Voices and Sealed with a Kiss, but the other demo tunes are kind of embarrassing. "Game Blaster Demo Tune" was better when John Williams wrote it for the London Symphony Orchestra circa 1977 (ahem). "Main Demo" is actually pretty good for the intro (the first 18 seconds), but then devolves into a cheesy folk melody that makes me think of songs like Camptown Races and Oh, Susanna, which wouldn't be so bad I guess if said melody weren't played (at 43 seconds in) on a totally inappropriate instrument that I can only describe as a sci-fi B-movie version of an old fashioned phone ringing. Then it all speeds up (mercifully, to get it over with faster?) at 1:43. "March" is passable, but nothing special, and the arcade game laser blast-sounding things in the intro feel out of place based on the rest of the song. Creative Labs weren't doing themselves any favors trying to sell the card based on demo tunes like these first three, in my opinion.
As for the in-game recordings, I haven't heard them all (besides the ones I'm about to mention, I only listened to the SMI intro and SQ1 intro). I will say that's the most anemic version of the Silpheed intro I've heard, though I haven't heard some things that could be worse like the IBM Music Feature. At least the Victrola Themes from Colonel's Bequest survive the conversion, if unspectacularly, with their dignity intact. (Times of Lore sounded OK, too, but I don't have a point of reference for that one. What this and the Victrola Themes have in common is that they both go for a big wash of electronic sound.) Are there others like these Victrola Themes I should listen to, in order to hear the device at something closer to its potential?
The kazoo picture is even funnier after the audio samples. But hey, at least it is a shiny, metal kazoo and not a cheap, plastic one. Unless it's plastic painted to look like metal, which could also be appropriate...
Voices and Sealed with a Kiss, though, persuade me that one could write decent stuff for this device, even if it's inferior to the Adlib.