09340: scion: Discrete sound effects are not emulated properly

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
09340	Sound	Minor	Always	Dec 21, 2025, 15:53	Dec 25, 2025, 05:36

Tester	JimCarlTay	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows (x64)
Status [?]	Acknowledged			Driver	seibu/wiz.cpp
Version	0.280	Fixed in Version		Build	x64
		Fixed in Git Commit		Github Pull Request #

Summary	09340: scion: Discrete sound effects are not emulated properly
Description	Compared to the Arcade Archives version, the game as emulated on MAME appears to rely solely on the AY-3-8910A PSG chips for sound effects, with no discrete sound effects to be heard. Tested with version 0.280 as the bug still happens on my current nightly build (b34bb05). Gameplay video of the Arcade Archives version for reference:
Steps To Reproduce	Load the game and start it by inserting a coin. Play through the first area and compare the sound effects heard to the ones as heard on the reference video.
Additional Information	The Arcade Archives video occasionally defaults to an auto-dub in "English" that induces a mistaken voice line ("Wow"). Before you view the video, make sure to change the video language to Japanese (Original) to ensure accuracy to real hardware (and the music sounds clearer there too).
Github Commit

Flags	Verified with Original
Regression Version
Affected Sets / Systems	scion

Attached Files

No.23958 hap Developer Dec 21, 2025, 16:37 edited on: Dec 21, 2025, 16:38	You claimed there's a voice saying "Wow" at 1:47. I don't hear any "Wow" voice in the video link after finishing the stage. Auditory illusion? :P
No.23959 JimCarlTay Senior Tester Dec 21, 2025, 16:42	It still sounds like "Wow" to me. Try a second earlier (1:46).
No.23960 JimCarlTay Senior Tester Dec 21, 2025, 16:43	(In the video). But in the game as emulated on MAME, I don't hear any voice lines.
No.23961 hap Developer Dec 21, 2025, 16:55	I agree that the discrete explosions and shot sounds different (although this is Arcade Archives, not a PCB). But nope, no wow voice.
No.23962 JimCarlTay Senior Tester Dec 21, 2025, 17:51	Just found a real hardware video. The sound there is just like the video of the Arcade Archives version I put up in the description.
No.23963 Haze Senior Tester Dec 21, 2025, 18:04	I can hear the 'WOW' very clearly in the Arcade Archives release, but it doesn't sound like it's coming from the game? I can't hear it at all in the real hardware video.
No.23964 JimCarlTay Senior Tester Dec 21, 2025, 19:00	The "Wow" thing seems like a mystery to us, and very certainly so.
No.23965 JimCarlTay Senior Tester Dec 21, 2025, 19:17	UPDATE: It was a side effect of an English auto-dub on the Arcade Archives video. Setting the language to Japanese Original means that the "Wow" soundbite is non-existent.
No.23966 Haze Senior Tester Dec 21, 2025, 23:14	So this is some YouTube AI bullshit? Good to know YouTube is now destroying potentially useful reference material...
No.23967 hap Developer Dec 22, 2025, 09:39	Youtube auto-dub can be disabled. Note that discrete sounds are emulated, just incorrectly (shot sound and explosions).