Hey guys. I have converted 13 Cassette tapes to wav from a Cassette deck into an M-audio interface into my pc.
I would like to batch process all files ‘automatically’ to normal mp3 level. I am seeing this video here but that is more manual processing. Can anyone direct me to a video or tutorial for what I am seeking please?
There are two kinds of normalization:
Regular normalization sets the peaks at (or near) the 0dB maximum. I think you have to use a macro if you want to automate that. (GoldWave calls it “maximize” which is a better English word but the correct technical term is “normalization”.)
You can do that manually to 13 tapes (or separately to a couple-hundred songs) and it won’t take as long as it took to record the 13 tapes! 
And it’s probably faster than creating and debugging a macro…
The peaks don’t correlate well with perceived loudness so regular normalization is NOT the best way to loudness-match. Most commercial CDs & MP3s are normalized but some are still louder than others.
Loudness Normalization attempts to match/set the perceived loudness. There are several ways of doing that automatically.
MP3Gain can process a folder-full of MP3s, adjusting them all to the same loudness.
There is also a version called WaveGain for WAV files.
Some software players support ReplayGain. With Replay Gain the actual audio data isn’t changed but a “tag” is added to the file that tells the player software how much to adjust the volume.
Apple has something similar to ReplayGain called Sound Check.
All of the popular streaming services use similar loudness normalization.
Broadcast radio uses a different method of compressing/limiting/boosting to make “everything loud”.
**NOTE -**Many quiet sounding songs are already normalized/maximized so they can’t be boosted without clipping (distortion). For that reason, ALL of these loudness normalization algorithms use a target volume that tends to lower the volume of most tracks. That’s sometimes a problem if you don’t have enough analog gain to go as loud as you want. Still there will be a few quiet-sounding songs that can’t be boosted to hit the loudness target.
Also, these are regular linear adjustments. There is ONE volume adjustment made to each track/song. If a song starts-out quiet and ends louder it will still sound that way. (The dynamic contrast is preserved as-intended.)
Oh yes, back in the day I had used mp3 gain to normalize volume, thanks!
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