Usage: aacgain.exe [options] <infile> [<infile 2> ...]
options:
        /v - show version number
        /g <i>  - apply gain i without doing any analysis
        /l 0 <i> - apply gain i to channel 0 (left channel)
                  without doing any analysis (ONLY works for STEREO files,
                  not Joint Stereo)
        /l 1 <i> - apply gain i to channel 1 (right channel)
        /r - apply Track gain automatically (all files set to equal loudness)
        /k - automatically lower Track/Album gain to not clip audio
        /a - apply Album gain automatically (files are all from the same
                      album: a single gain change is applied to all files, so
                      their loudness relative to each other remains unchanged,
                      but the average album loudness is normalized)
        /m <i> - modify suggested MP3 gain by integer i
        /d <n> - modify suggested dB gain by floating-point n
        /c - ignore clipping warning when applying gain
        /o - output is a database-friendly tab-delimited list
        /t - writes modified data to temp file, then deletes original
             instead of modifying bytes in original file
             A temp file is always used for AAC files.
        /q - Quiet mode: no status messages
        /p - Preserve original file timestamp
        /x - Only find max. amplitude of file
        /f - Assume input file is an MPEG 2 Layer III file
             (i.e. don't check for mis-named Layer I or Layer II files)
              This option is ignored for AAC files.
        /? or /h - show this message
        /s c - only check stored tag info (no other processing)
        /s d - delete stored tag info (no other processing)
        /s s - skip (ignore) stored tag info (do not read or write tags)
        /s r - force re-calculation (do not read tag info)
        /u - undo changes made (based on stored tag info)
        /w - "wrap" gain change if gain+change > 255 or gain+change < 0
              MP3 only. (use "/? wrap" switch for a complete explanation)

If you specify /r and /a, only the second one will work.
If you do not specify /c, the program will stop and ask before applying gain
        change to a file that might clip.