Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
08360 Sound Minor Always 10 days ago 7 days ago
Tester sasuke View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows 10/11 (64-bit)
Status [?] Acknowledged Driver system1.cpp
Version 0.244 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary 08360: wbml and clones: On SEGA System 2 PCB, two SN76489As volume is different
Description In MAME, sound volume of two SN76489As is same.
But on SEGA System 2 (And System 1?) PCB, volume of the two chips seems to be different.
For example, in round 7 of Monster Land, the sound of the flute blowing scene, a difference that is disconcerting to those who are familiar with this game.
(Flute sounds may sound random and slightly different because the waveforms cancel each other out. This is the same with PCB.)

Compared to Round 1 BGM, sn2 sounds at least 1.4 times louder than sn1.
Steps To Reproduce
Additional Information Official interview to SEGA and M2 from Japanese Game media Inpress Watch
https://game.watch.impress.co.jp/docs/interview/1186972.html

> 駒林氏: 一番最初にチェックした時に、何だか音が違うなあと思ったんですよ。7面の「南の島ポロロ」で鳴る笛の音の通りが、アーケードの基板の音と何回比べても違っていたので、「ここがおかしいから直してくれ」と僕のほうからお願いをしました。調べてみたら、基板に載っている2個の音源の音量バランスが違っていたことがわかったので、そこを調整した結果、今までで間違いなく実機に一番近い音が鳴るようになりました。

> Mr. Komabayashi: When I first checked the game, I thought the sound was somehow different.
The sound of the flute in "South Island Pororo" on round 7 was different from the sound on the arcade board, no matter how many times I compared it to this.
I found that the volume balance of the two sound chip on the board was different, so I adjusted the volume balance and the sound is now definitely the closest to that of the actual board.

Monsterland Switch version with volume adjusted as per this interview.
Github Commit
Flags Verified with Original
Regression Version
Affected Sets / Systems wbml and clones
Attached Files
ogg file icon Monster Land PCB 1.ogg (3,787,465 bytes) 10 days ago Uploaded by sasuke
Monster Land Sounds recorded from PCB
ogg file icon Monster Land PCB 2.ogg (3,566,085 bytes) 10 days ago Uploaded by sasuke
Monster Land Sounds recorded from PCB (from middle of round 7)
ogg file icon mame1.ogg (512,044 bytes) 10 days ago Uploaded by sasuke
Monster Land MAME 0.244 sn1 100%, sn2 100% (Melody sounds a little tinny.)
ogg file icon mame2.ogg (528,766 bytes) 10 days ago Uploaded by sasuke
Monster Land MAME 0.244 sn1 100%, sn2 140%
ogg file icon PCB Flute Sounds.ogg (535,617 bytes) 10 days ago Uploaded by sasuke
Monster Land Sounds recorded from PCB (Flute Sounds)
ogg file icon MAME Flute1.ogg (311,585 bytes) 10 days ago Uploaded by sasuke
Monster Land MAME 0.244 sn1 100%, sn2 100% (Flute Sound)
ogg file icon MAME Flute2.ogg (416,270 bytes) 10 days ago Uploaded by sasuke
Monster Land MAME 0.244 sn1 100%, sn2 140% (Flute Sound)
zip file icon mame0244state_wbml.zip (8,032 bytes) 10 days ago Uploaded by sasuke
State file of round 7 flute point (wbml, MAME 0.244)
Relationships
There are no relationship linked to this issue.
Notes
0
There are no notes attached to this issue.