Timer issues

[freq-mod]

⇒ When nearly perfectly synced with a media player, the timer in Furnace seems to slowly drift behind. VERY slowly, at least on the Mega Drive. Further investigation necessary, with a focus on other systems.

⇒ Sometimes, when playing from the middle of a song, Furnace underestimates how much time would have already passed. Maybe it's the song tempo? Maybe the chips involved?

Issue seen with these (all my covers - should I list demo songs instead?)... Atari 2600/7800 (60Hz) • TIA ——— Bad Apple!! (sp 6, vt 138/150) Mega Drive • YM2612 + SN76489 (60Hz) ——— Cab — Angel With A Shotgun (as seen in the video) (sp 6, vt 124/150) Mega Drive (60Hz) ——— Bad Apple!! (sp 6, vt 138/150) Master System w/ FM • SN76489 + YM2413 ——— Cab — Angel With A Shotgun (sp 6, vt 124/150) NES • 2A03 ——— Michael Jackson — Smooth Criminal (sp 6, vt 120/150) NES — WORLD 1-1 (sp 1, vt 100/150) (FAR off) Game Gear • SN76489 ——— Michael Jackson — Beat It (sp 6, vt 138/150) Game Gear ——— Evanescence — Bring Me To Life (sp 3, vt 96/150)

Issue NOT seen on... Commodore PET (50Hz) ——— Bad Apple!! (sp 6, vt 138/125) 2x AY-3-8910 (60Hz) ——— Bad Apple!! (sp 6, vt 138/150) Mega Drive (44Hz) ——— Linkin Park — Shadow Of The Day (sp 6, vt 150/150)

https://github.com/user-attachments/assets/0a2e7c3e-9b9b-4ec9-8db0-4363e1ab7cc6