Well, thanks.

Hi. Today, I found many scratches on the plastic frame around WMPort and they can't be wiped out. I'm wondering it's because of my improper behavior or it's normal (material and design issues).

Few years ago, I used "MP3Gain" to "normalize" the volume of MP3 Files, replay gain is only a tag…Seems a plug-in of Foobar2000 can remove that tag, but I can't find that plug-in now…

Sony MDR-1A is a good choice.

Seems Mac Version is still in beta…   You are really an experienced musician!

Ha…I've viewed your profile. By the way, I major in classic piano performance at a conservatory, I'm also a keyboard player in a post-rock/progressive metal band… Wait, you can play jazz trombone, cool! I'm still learning jazz harmony and acoustic guitar by myself, hope one day I can join a jazz...

  Both, sometimes I can hear the differences.

I felt some differences in high frequency, it also hears a bit "darker"…Well, that's someway acceptable…   Thanks for your advice, I have kept the original m4a file. :)

Well, some of my albums are from iTunes Store, I use Apple lossless for those ripped from CDs. I also got an iPod Classic.   For the classic music/ well-recorded acoustic Pop/Rock, lossless format is necessary, for others, high bitrate AAC is enough. :)   By the way, are you a guitar player...

I own a B&O Beosound 6 portable player, it only support the mp3 file format. If I convert m4a file (from iTunes Library) to mp3 (320kbps), is the losses acceptable (192 kbps mp3 is my bottom line)?   Thanks.