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You do have to have a good set of ears for this, a audio editing program like Audacity, and note where the samples that represent the loop are to use the tool.
SA2's ADX files are 16-bit 32000Hz WAV PCM. The Tool -[DEXTERITY]- mentioned will show you the current loop points*, so make note of them. Do know that music at a higher or lower frequency will alter the sample rates.
*Correction: The encoder will show the beginning and end samples, the player shows the end samples, or you could use the loop points from smashcustommusic.com
I learned how to do it the hard way back in 2014 with my New ADX mod, it was made using StoE (Start to End) Looping, and PES Sound Converter, I had to edit the songs so they would sound good during looping (This method also resulted in a smaller file size).
Which I remade around the time Forces came out. This one uses more up to date actual sample looping, and the CRI ADX Tools. I had all the files to remake it, but I didn't make all the loop points myself, I used SmashCustomMusic's archive (which has the loop points and KHz for the audio) for most of them.