Oh so you have a module player in the game already, that's really cool. So S3M, XM, or MOD files I guess. Are they Amiga or C64 modules? It sounds very much like the SID to me.
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I'm using Sunvox library, and I was able to play some XM and MOD for testing purpose. As for the rest, I'm still discovering how it works, as each aspect of making a small game like that is an endless pit of very peaky knowledge 😅