Just make notes of all the integrated levels of your song snippets. R128 wants tv programs to all be at -23 LUFS, but you don't care about this. You can simply ignore M (momentary) and S (short term) loudness and just look at the I (integrated) level. You will have to differentiate between M, S and I loudness values. Measure all these isolated parts using the above tool or another R128 measuring tool. If a song has several drops, you can just take a single portion of a few seconds that is representative of the loudness of the song. Isolate the parts of all your songs that you want to sound the same to the listener. Now comes the tricky thing: if your song has a loud part and a more quiet part, statistics dictates that the perceived integrated loudness for the the song you're measuring is a function of the entire song. Perceived loudness according to R128 is measured in LUFS (loudness units full scale), but these are identical to deciBels, except that they are measuring an RMS window over a certain time (which is of course the only way to measure perceived loudness). I hope you're on a Mac, because then you can use this free commandline tool: The best way currently available to measure perceived loudness is using the R128 standard. What you can do is measure the perceived loudness for all your songs and then adjust the gain accordingly. You are talking about perceived loudness.
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