05536: nemesis & clones: Distorted sound effects

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
05536	Sound	Minor	Always	Apr 19, 2014, 20:00	Dec 5, 2015, 09:37

Tester	Ace	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows Vista/7/8 (64-bit)
Status [?]	Confirmed			Driver	konami/nemesis.cpp
Version	0.153	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	05536: nemesis & clones: Distorted sound effects
Description	When multiple sound effects overlap or certain sounds are played, the audio gets severely distorted. A sample of the distortion in question is attached to this report. This was never an issue in previous versions of MAME.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version	0.153
Affected Sets / Systems	nemesis & clones

Attached Files	Nemesis distortion.flac (1,806,025 bytes) Apr 19, 2014, 20:00 Uploaded by Ace

No.12041 Dr.Venom Tester Sep 23, 2015, 16:01	The audio distortion was introduced with the filter and AY8910_SINGLE_OUTPUT addition in 0.153. More specifically with this commit: http://git.redump.net/mame/commit/?id=44add8d8efd1fe139ae490ccd2c91b1a86dad65a The audio glitching can be heard very frequently, especially when continuously firing and dropping bombs at the same time. It's a game breaker if you ask me. The problem seems to be with the use of AY8910_SINGLE_OUTPUT. Reverting the audio output in static MACHINE_CONFIG_START( nemesis, nemesis_state ) from: /* sound hardware / MCFG_SOUND_ADD("ay1", AY8910, 14318180/8) MCFG_AY8910_OUTPUT_TYPE(AY8910_LEGACY_OUTPUT \| AY8910_SINGLE_OUTPUT) MCFG_AY8910_PORT_A_READ_CB(READ8(nemesis_state, nemesis_portA_r)) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "filter1", 0.20) to: / sound hardware */ MCFG_SOUND_ADD("ay1", AY8910, 14318180/8) MCFG_AY8910_OUTPUT_TYPE(AY8910_LEGACY_OUTPUT) MCFG_AY8910_PORT_A_READ_CB(READ8(nemesis_state, nemesis_portA_r)) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.40) does away with the audio glitching for overlapping sound effects, as reported by Ace.
No.12228 Firehawke Developer Dec 5, 2015, 09:37	I believe may also show the effects in comparison to the original board as well.

No.12041

Dr.Venom

Tester

Sep 23, 2015, 16:01

The audio distortion was introduced with the filter and AY8910_SINGLE_OUTPUT addition in 0.153. More specifically with this commit: http://git.redump.net/mame/commit/?id=44add8d8efd1fe139ae490ccd2c91b1a86dad65a

The audio glitching can be heard very frequently, especially when continuously firing and dropping bombs at the same time. It's a game breaker if you ask me.

The problem seems to be with the use of AY8910_SINGLE_OUTPUT.

Reverting the audio output in static MACHINE_CONFIG_START( nemesis, nemesis_state ) from:

/* sound hardware */
MCFG_SOUND_ADD("ay1", AY8910, 14318180/8)
MCFG_AY8910_OUTPUT_TYPE(AY8910_LEGACY_OUTPUT | AY8910_SINGLE_OUTPUT)
MCFG_AY8910_PORT_A_READ_CB(READ8(nemesis_state, nemesis_portA_r))
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "filter1", 0.20)

to:

/* sound hardware */
MCFG_SOUND_ADD("ay1", AY8910, 14318180/8)
MCFG_AY8910_OUTPUT_TYPE(AY8910_LEGACY_OUTPUT)
MCFG_AY8910_PORT_A_READ_CB(READ8(nemesis_state, nemesis_portA_r))
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.40)

does away with the audio glitching for overlapping sound effects, as reported by Ace.

No.12228

Firehawke

Developer

Dec 5, 2015, 09:37

I believe

may also show the effects in comparison to the original board as well.