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As promised, a video of VGM playback on a MBHP_Genesis module! There is still one issue with the frequency correction, which occasionally leads to wrong notes in certain VGM files, but I understand what the issue is and will fix it when I get a chance. Also, there's an inherent incompatibilty between the noise channel in the SN76489 and the one in the SN76489-clone used in the actual Mega Drive / Genesis (shift register length and therefore pitch, and also what happens with zero frequency). I may be able to have the software correct for it in certain cases, but it's not a huge deal overall.

Finally working thank you guys

Juno style !!!

Hey, Thanks! I think Altitude (I believe he is a member of this forum) did one. But find it a bit harsh to contact him privately, so I hope he would read this and let us know.

And your " u8 led_startstop = 14; " must be outside of any function. If it was inside a function then it can only be found and used by that function.