09521: qbert (all sets) and qbertqub: sound cuts off after a while and doesn't come back (except for the knocker)

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
09521	Sound	Major	Random	Aug 11, 2026, 21:08	26 days ago

Tester	jeff p	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Fixed	OS	Windows (x64)
Status [?]	Resolved			Driver	gottlieb/gottlieb.cpp
Version	0.289	Fixed in Version	0.290GIT	Build	x64
		Fixed in Git Commit	3314e1b	Github Pull Request #	#15906

Summary	09521: qbert (all sets) and qbertqub: sound cuts off after a while and doesn't come back (except for the knocker)
Description	After playing the game for a while, all sound (except for the knocker) will eventually cut off. Once off, it is off for the rest of the play session. A soft reset with F3 will not help; only a hard reset (Esc, then relaunch) can bring the sound back, but the sound will eventually shut off again.
Steps To Reproduce
Additional Information
Github Commit

Flags	Regression
Regression Version	0.289
Affected Sets / Systems	qbert (all sets) and qbertqub

Attached Files

No.24583 Robbbert Moderator Aug 11, 2026, 23:55 edited on: Aug 11, 2026, 23:58	I pressed insert to speed things up in the attract mode, and sure enough the sound eventually muted.
No.24584 Robbbert Moderator Aug 12, 2026, 00:04 edited on: Aug 12, 2026, 00:07	Found that by entering the "Audio Effects" menu, speaker, Filters, change it from Active to Bypass, and the sound comes back. The downside of this is that the voice effects are just a bunch of crackles. So, yes, definitely a problem there. EDIT: A bit more, it seems that the problem is with the voice effects. After a while they change from voices to crackling/muting. When this happens, all the sound is lost apart from the knocker sample. And lastly, there's a warning at start that the sound is imperfectly emulated. So this might even be an invalid report. Devs can decide.
No.24593 hap Developer 31 days ago	regression from https://github.com/mamedev/mame/commit/1bb10e1547cfd719676c528ab5055f338c503279
No.24607 Robbbert Moderator 27 days ago	Seems to be fixed as at https://github.com/mamedev/mame/commit/3314e1bf934826724f6a051d13f133b6bf5520bf