What kind of converter do you use to convert m4p to mp3? Personally, I use NoteBurner.
It converts any DRM protected music files (such as M4P, M4A, WMA, M4B) and unprotected music (WMA, MP3, rax, MP4, WAV, RA, snd, AAC, OGG, AA, aif) to plain MP3, WAV, WMA formats with Virtual CD-RW drive. It is a protected audio and music converter tool designed for virtually burning DRM protected music or audio files to a special virtual CD-RW drive where you can easily get plain MP3, WMA or WAV files ready for use on any computers or music devices.
I use converter TuneCab - media converter for DRM-protected or unprotected files for playing on PCs, mobile phones, MP3 players, MP4 players and iPods, PDAs, PSPs and other devices. It converts music, films, video clips, audio books to commonly used formats such as MP3, AAC, WAV audio, MPEG4, DivX movie etc, has YouTube Ripper plugin and CD Ripper.
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