Two redumps.
I realized the opening music modifier had already existed for several years after I went and did so myself (I can confirm I came to the same result), but I did record the values...
You must use a value divisible by 02. The range is 80-86, 8C-94. 88-8A is silence. There is no more music after 94.
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Just consider me your friendly SPC dumper. Also a bit of a perfectionist (though not too literally)... I make sure my dumps are at the first note. I might even hack away the SFX if needed.
Want a music modifier for a particular SNES game? All you need to do is ask via PM (or you can check out the Music Modifiers topic and post there) and I'll be on the job. ^_^
SPC Set Progress Log