03363: vanguard, vanguardc, vanguardj: Broken enemy firing sound

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
03363	Sound	Minor	Always	Jul 27, 2009, 07:43	Jul 6, 2019, 18:44

Tester	Gyrovision	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS
Status [?]	Confirmed			Driver	snk/snk6502.cpp
Version	0.133	Fixed in Version		Build
		Fixed in Git Commit		Github Pull Request #

Summary	03363: vanguard, vanguardc, vanguardj: Broken enemy firing sound
Description	The enemy ship's firing sound in MAME is an incorrect high pitched hiss. The hiss has to do with the #2 mono SN76477 (SN76477.2) The hiss first appears in 0.112 but is absent in 0.111. There were 6 "U" releases between 0.111 and 0.112. In 0.111u6 the SN76477 was rewritten, it's possible it may have been broken in 0.111u6 but I cannot test it to confirm.
Steps To Reproduce	Temporarily remove or disable vanguard external samples to hear the problem more clearly. Play the game and after about a minute the enemy ships will start shooting at you and you can easily compare the bad sound in MAME to the YouTube video.
Additional Information	http://www.mameworld.info/ubbthreads/showflat.php?Cat=&Board=mametesters&Number=112754&Forum=All_Forums&Words=vanguard&Match=Entire%20Phrase&Searchpage=0&Limit=25&Old=allposts&Main=112754&Search=true#Post112754
Github Commit

Flags	Verified with Original
Regression Version
Affected Sets / Systems	vanguard, vanguardc, vanguardj

Attached Files	03363 - vanguard vanguardc - ENEMY firing sound.zip (699,810 bytes) Jun 16, 2011, 05:17 Uploaded by Gyrovision ENEMY sound video clip

No.16626 MetalGod Senior Tester Jul 6, 2019, 18:39 edited on: Jul 6, 2019, 18:45	The issue still exists. The provided video doesn't work anymore, so I've found another one. We can check the original sound here 13:05 Edit: I've also added the japanese version of the game, vanguardj. All clones affected then.