thanks Jonathan. this is what i assumed re LGPL when i saw a discussion about using fluidsynth in a build, which has a LGPL variant but not anything more permissive. so one question would be if anyone here on the list had a paid app rejected or accepted on the App Store due to using an LGPL license? expr and expr~ are very useful for a variety of things but for now i'm not using them due to this offchance.
i would further guess that FSF's exact words on LGPL were probably pretty dark on using the iTunes Store in general. i've seen some announcements from them in the past that made it clear how they feel about walled gardens.
best,
scott