Well I've been busy testing alot of stuff out and did a full test of all 902 GBS files in one of the GBS collections, and came across 20 tunes that seem to be buggy.
I am not sure if it's my hardware or the GBS files, but here's the list anyways. Some of them don't work at all or properly in the winamp plugin either so probably buggy.
A few of these tunes that do not play at the proper rate on my hardware do in the winamp plugin, but IMO they are still broken since they will play at the wrong rate on real hardware too. They tend to poke bad stuff into the tcon register or set the wrong mode (vblank vs. timer).
102 Dalmatians - Puppies to the Rescue (GBC)(2000)(Digital Eclipse)(Activision).gbs
* This GBS writes to the timer register but puts it in TMR mode instead of the proper VBLANK mode it seems. this causes the tune to play very slowly. It loads 04h into the timer register. It should run in the VBLANK mode.
Animorphs (GBC)(2000)(Run and Gun!)(Ubisoft).gbs
* Plays way too fast. Should use the VBLANK mode I think.
Bugs Bunny Collection (1997)(Kemco).gbs
* Plays a few iterations of the play routine then dies.
Dr. Ling ni Kiitemite! - Koi no Rin Feng Shui (GBC)(2002)(Will)(Hudson).gbs
* Silent (plays on nezplug)
Duke Nukem (1999)(Torus)(GT).gbs
* Plays waay too fast. Should be in VBLANK mode I think.
Front Row (GBC)(1999)(KID).gbs
* Silent (plays on nezplug)
Game & Watch Gallery [Game Boy Gallery] (1997)(Tose)(Nintendo).gbs
* Silent (plays on nezplug)
Game Boy Color Promotional Demo (GBC)(1998)(Nintendo).gbs
* Plays, but not properly (plays OK on nezplug)
Grandia - Parallel Trippers (GBC)(2000)(Will)(Hudson).gbs
* Silent (plays on nezplug)
Kaseki Sousei Reborn (1998)(Freeqsoft)(Starfish).gbs
* Silent on nezplug also
Little Nicky (GBC)(2000)(Digital Eclipse)(Ubisoft).gbs
* Silent on nezplug also
Pocket Puyo Puyo Tsuu (1996)(Compile).gbs
* Silent (plays on nezplug)
Rainbow Islands (GBC)(2001)(Taito).gbs
* Silent (plays on nezplug)
SD Gundam - SD Sengokuden Kunitori Monogatari (1989)(-)(Bandai).gbs
* Crashes with a bad noise (same on nezplug)
SD Gundam Gaiden - Lacroan Heroes (1990)(-)(Bandai).gbs
* Silent on nezplug also
Super Mario Land 4 (1997)(Unknown).gbs
* Crashes (plays OK on nezplug)
Sylvania Melody - Mori no Nakama to Odori Mashi! (GBC)(2000)(Natsume)(Epoch).gbs
* Silent (plays on nezplug)
Xtreme Sports (GBC)(2000)(WayForward)(Infogrames).gbs
* Silent on nezplug also
Yu-Gi-Oh! - Dark Duel Stories [Yu-Gi-Oh! Duel Monsters 3 - Sanseisenshin Kourin] (GBC)(2000)(KCE Japan)(Konami).gbs
* Silent on nezplug also
Zoids - Jashin Fukkatsu! Genobreaker-hen (GBC)(2000)(Will)(Tomy).gbs
* Silent (works on nezplug)
I am not sure if it's my hardware or the GBS files, but here's the list anyways. Some of them don't work at all or properly in the winamp plugin either so probably buggy.
A few of these tunes that do not play at the proper rate on my hardware do in the winamp plugin, but IMO they are still broken since they will play at the wrong rate on real hardware too. They tend to poke bad stuff into the tcon register or set the wrong mode (vblank vs. timer).
102 Dalmatians - Puppies to the Rescue (GBC)(2000)(Digital Eclipse)(Activision).gbs
* This GBS writes to the timer register but puts it in TMR mode instead of the proper VBLANK mode it seems. this causes the tune to play very slowly. It loads 04h into the timer register. It should run in the VBLANK mode.
Animorphs (GBC)(2000)(Run and Gun!)(Ubisoft).gbs
* Plays way too fast. Should use the VBLANK mode I think.
Bugs Bunny Collection (1997)(Kemco).gbs
* Plays a few iterations of the play routine then dies.
Dr. Ling ni Kiitemite! - Koi no Rin Feng Shui (GBC)(2002)(Will)(Hudson).gbs
* Silent (plays on nezplug)
Duke Nukem (1999)(Torus)(GT).gbs
* Plays waay too fast. Should be in VBLANK mode I think.
Front Row (GBC)(1999)(KID).gbs
* Silent (plays on nezplug)
Game & Watch Gallery [Game Boy Gallery] (1997)(Tose)(Nintendo).gbs
* Silent (plays on nezplug)
Game Boy Color Promotional Demo (GBC)(1998)(Nintendo).gbs
* Plays, but not properly (plays OK on nezplug)
Grandia - Parallel Trippers (GBC)(2000)(Will)(Hudson).gbs
* Silent (plays on nezplug)
Kaseki Sousei Reborn (1998)(Freeqsoft)(Starfish).gbs
* Silent on nezplug also
Little Nicky (GBC)(2000)(Digital Eclipse)(Ubisoft).gbs
* Silent on nezplug also
Pocket Puyo Puyo Tsuu (1996)(Compile).gbs
* Silent (plays on nezplug)
Rainbow Islands (GBC)(2001)(Taito).gbs
* Silent (plays on nezplug)
SD Gundam - SD Sengokuden Kunitori Monogatari (1989)(-)(Bandai).gbs
* Crashes with a bad noise (same on nezplug)
SD Gundam Gaiden - Lacroan Heroes (1990)(-)(Bandai).gbs
* Silent on nezplug also
Super Mario Land 4 (1997)(Unknown).gbs
* Crashes (plays OK on nezplug)
Sylvania Melody - Mori no Nakama to Odori Mashi! (GBC)(2000)(Natsume)(Epoch).gbs
* Silent (plays on nezplug)
Xtreme Sports (GBC)(2000)(WayForward)(Infogrames).gbs
* Silent on nezplug also
Yu-Gi-Oh! - Dark Duel Stories [Yu-Gi-Oh! Duel Monsters 3 - Sanseisenshin Kourin] (GBC)(2000)(KCE Japan)(Konami).gbs
* Silent on nezplug also
Zoids - Jashin Fukkatsu! Genobreaker-hen (GBC)(2000)(Will)(Tomy).gbs
* Silent (works on nezplug)