07115: spf2t (qsound): Distortion of sound effects mainly in left sound channel of spf2t

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07115	Sound	Minor	Always	Oct 14, 2018, 23:37	Oct 17, 2018, 17:11

Tester	kujina	View Status	Public	Platform	MAME (Official Binary)
Assigned To	ctr	Resolution	Fixed	OS	Windows Vista/7/8 (64-bit)
Status [?]	Resolved			Driver	capcom/cps2.cpp
Version	0.202	Fixed in Version	0.203	Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	07115: spf2t ( qsound): Distortion of sound effects mainly in left sound channel of spf2t
Description	Distortion of sound effects, mainly in the left sound channel. You will frequently hear distortion in the sound just by letting the game run or by playing. When the game starts and you hear ‘Capcom’ you always get the distortion in the left sound channel. The distortion occurs consistently with many specific sound effects. Lowering the game volume(s) doesn’t eliminate the distortion. I did some testing and this distortion is NOT present in mame versions 0.200 and 0.19X. BUT it IS also present in mame version 0.201
Steps To Reproduce	You can reproduce the distortions every time by running the game or in the game service menu. Some examples - sound code no: 00A0 distorts in the left channel, sound code no: 00D0 distorts in the right channel and sound code no: 0120 distorts in both channels.
Additional Information
Github Commit

Flags
Regression Version	0.201
Affected Sets / Systems	spf2t (qsound)

Attached Files

No.15542 Tafoid Administrator Oct 16, 2018, 22:46	I can confirm that there is a click happening in the cases you mentioned above. Daily binary testing seems to isolate the issue starting after the HLE QSound updates here on August 18, 2018 https://github.com/mamedev/mame/commit/e6d8313105b0b511dd962b6a7040cb13991cf169
No.15549 Tafoid Administrator Oct 17, 2018, 17:11	Fixed clipping issues by superctr: https://github.com/mamedev/mame/commit/b0bf4e45402b0c2b32883782af1df776ca5eab64