I have an album of separate MP3 files. I want to join the files in order to edit audio levels for the entire album. After making changes I want to be able to split the track into separate MP3 files once again. I know that a single track can be cut using a cue sheet. I would like to know if I can create a cue sheet based on the track lengths of the individual MP3 files before I join them?
MP3Gain will edit the audio levels of individual MP3 files logically as if they are an entire album.
http://mp3gain.sourceforge.net/ (http://mp3gain.sourceforge.net/)
I want to join the files in order to edit audio levels for the entire album. After making changes I want to be able to split the track into separate MP3 files once again.
FYI - You can apply the same gain to all files without combining them first. For example, combining all of the files into a single file and boosting the gain by 2dB and re-splitting will give you the exact-same results as applying a 2dB gain to each individual file .
If you
increase the volume, you have to be careful to avoid clipping (distortion). There is no issue with reducing volumes. Most digital albums are already normalized/maximized for 0dB (or
near 0dB) peaks, even though some albums sound louder than others. And, some quiet-sounding songs have 0dB peaks.
If I wanted to normalize (maximize) an album with individual files, here's how I'd approach it:
Load the files into my audio editor* (I happen to use GoldWave), and scan to find the track with the highest peak.
That peak tells me how much I can increase the gain without clipping. If the highest peak on all files is -4dB, I can safely boost all files by 4dB (or less if I wish). If there is a 0dB peak, I can't increase the level on all files without clipping.
* MP3 is lossy compression, so it's best to use a special-purpose non-distructive editor when you're doing something simple like a volume change, which can be done non-distructively. MP3Gain is also non-destructive. But all "regular" audio editors (GoldWave, Audacity, Audition, etc.) decompress the file before editing, and that means a 2nd lossy compression step if you re-save as MP3.
Also, the MP3 format itself doesn't have the 0dB limit like (integer WAV files), but clipping can happen depending on how its encoded & decoded, so it's generally good practice to keep the peaks below 0dB.
+2 dB isn't the best example; if making the adjustment via the global gain field (like with MP3Gain), then you're restricted to 1.5 dB increments.
MP3Gain has a -k switch and equivalent in the GUI to prevent clipping, so you shouldn't need to do the pre-scan with GoldWave.