That's due to Tone Doubler, the mmlgui manual explains a bit more on this. However, this technique was widely known back then. It's why "The Final Fight" from Sonic 3D Blast sounds more full. 2op instruments, but you get more polyphony and save a few more channels.
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Seems like a song from a sonic menu, like a sonic mania menu
I did envisioned this as menu music and something more light-hearted.
Those chords sound like something from sonic 3d
That's due to Tone Doubler, the mmlgui manual explains a bit more on this. However, this technique was widely known back then. It's why "The Final Fight" from Sonic 3D Blast sounds more full. 2op instruments, but you get more polyphony and save a few more channels.