Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
06932 Sound Minor Always Apr 5, 2018, 05:00 May 23, 2021, 14:56
Tester ArcadeGuy View Status Public Platform Other
Assigned To Resolution Open OS Windows Vista/7/8 (32-bit)
Status [?] Acknowledged Driver m72.cpp
Version 0.196 Fixed in Version Build 32-bit
Fixed in Git Commit Github Pull Request #
Summary 06932: many irem m72 sets: [possible] vgm & sfx problem
Description vgm to loud and sfx to low
sound effects like screams,explosions,shots are to low compared to vgm on many m72 irem games
lightning swords is one
Steps To Reproduce play the game
Additional Information
Github Commit
Flags Possible
Regression Version between 176,77,78
Affected Sets / Systems many irem m72 sets
Attached Files
There are no relationship linked to this issue.
User avatar
Apr 5, 2018, 08:47
Sound Balance/Proportion
Except for heavy regression, a report for sound balance/proportion between multiple sound devices always needs the original references to determine the correct value of each volume. Direct sound recording of the PCB is the most appropriate. We will accept arcade soundtrack but please keep it in mind that they usually have delay affected/echoed/remixed and don't always represent the real sound balance correctly.

We need specific a machine example here with reference recordings for that machine for this to even be accepted.
Otherwise, you can simple adjust the Sliders to set the volume of your choice to each sound element.
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Apr 5, 2018, 18:19

User avatar
Apr 6, 2018, 14:19
Thanks for the examples, haynor666.

I'll acknowledge this for now pending research/investigation.
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Senior Tester
Jan 5, 2019, 02:44
This is related to 07075 (hammerin' harry victory scream)
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Apr 10, 2019, 01:14
As reporter in 07075, recently the DAC volume for M72 driver has been increased against version 0.207 in +3,5dB, but it's still under the values of Mame 0.172 (reggression version) in -2,6dB. Cannot be set as resolved until checking the true DAC PCB volume.
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Senior Tester
Jul 2, 2019, 05:42
edited on: Jul 2, 2019, 05:43
in mame/drivers/m72.cpp at line 1866:
DAC_8BIT_R2R(config, "dac", 0).add_route(ALL_OUTPUTS, "speaker", 0.3); // unknown DAC
change to
DAC_8BIT_R2R(config, "dac", 0).add_route(ALL_OUTPUTS, "speaker", 0.4); // unknown DAC
will make the volume really close to PCB videos posted here and to the value of MAME 0.172.
Obviously this still need confirmation agaisnt a PCB.
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May 23, 2021, 14:56
edited on: May 23, 2021, 15:06
Affected with commit b8849e0341db7815ec83f1f3c4879abbf35586b5, which solves 07075 but I am not clear that this one is resolved.

Tested R-Type first level and all music and sfx sound lower, maybe someone with a greater knowledge of this game or other m72 sets can verify it more exactly.

Edit: Tested lightning swords and the fix is very noticeable with the character scream when dying.