Update: I use "CanOpener", a player which supports FLAC and which I want to continue to use due to its (excellent) incorporated headphone crossfeed. Due to Apple's stubborn refusal to support the popular FLAC format, however, managing Music files in general becomes more complicated, Transcoding all my FLAC to ALAC would let iTunes manage all the file transferring stuff, but I don't want to do that. Apple lossless files have the same file extension as garden-variety .aac files that iTunes creates by default, and because the phone doesn't natively support FLAC, file management must be done manually. I did this according to Apple's directions, but the app doesn't detect the files

Maybe I need to start a thread in The Apple Core or over on Computer Audiophile, as my problem seems to be more a file management problem than a player selection problem.