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Software to easily maintain collections of mp3 files with the best quality and the smallest file size, taking into account both the maximum required quality and the compatibility with the target (hardware/software) player. Opens audio files with any of the types AAC, AIFF, AU, FLAC, M4A, MP3, OGG, OGA, OPUS, RA, RM, WAVE, WMA, or WV and, when necessary, converts the corresponding audio into the mp3 format. When the audio on the found files needs to be encoded into the mp3 format, the program, to achieve the best quality, uses the latest version of LAME, version 3.100, which has been customly compiled to adapt to the in-use cpu, so that it can be used with cpus as old as the Pentium and Windows versions as old as Windows XP. The program is profile based, to make it easier to use. Specifically, there are two main profiles, the Audiophile (bitrate 320kbps) and the on-the-go (bitrate 192kbps) ones, which are further subdivided in stereo or mono. The encoding method for mp3 files can be chosen (abr, cbr, or vbr), so that one can choose whether to use the better encoding method in terms of both quality and file size (variable-bit-rate = vbr) or the most compatible one (constant-bit-rate = cbr). As encoding audio into the mp3 format is a lossy operation (loses quality), whenever possible the original audio is not re-encoded, being the stream corresponding to it (assuming it is already in the mp3 format) just copied to the target file as is or with its frames re-formatted as required to be in accordance with the target format. When the original audio is not (re-)encoded, the process is lossless (no loss of quality) and, as so, does not use LAME but code specifically created for the purpose by the author of this program. The program is batch-based, meaning that as soon as the settings are chosen they can be applied to as many files as you wish - you just have to let it process all of them. The program does not require any installation - it is a portable one.