Well, I just got back from testing Mike's suggestion of setting the Roland Boutique D-05 as a playback quirk, disabling its capture quirk, and setting that endpoint test section to always be skipped. Sure, enough, the D-05's playback is now perfectly crystal clear without the crackles associated with an LP record. This is just a guess until I recompile again, but my capture from the D-05 reports a read error, seemingly just as the vanilla mainline kernel does, and I think it's because I disabled its capture quirk line. So, it seems to me that the D-05 needs both quirk table entries, whether or not the GT-1 does.
