04567: flstory: MSM5232 tone duration is longer in MAME.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
04567	Sound	Trivial	Always	Dec 15, 2011, 20:01	4 days ago

Tester	Fujix	View Status	Public	Platform
Assigned To		Resolution	Open	OS
Status [?]	Confirmed			Driver	taito/flstory.cpp
Version	0.144u3	Fixed in Version		Build
		Fixed in Git Commit		Github Pull Request #

Summary	04567: flstory: MSM5232 tone duration is longer in MAME.
Description	MSM5232 tones decay less than the real PCB, which result undamped sounds. Recordings of the real PCB attached.
Steps To Reproduce
Additional Information
Github Commit

Flags	Verified with Original
Regression Version
Affected Sets / Systems	flstory

Attached Files	01.MP3 (87,387 bytes) Dec 15, 2011, 20:02 Uploaded by Fujix PCB recording
	02.MP3 (849,546 bytes) Dec 15, 2011, 20:02 Uploaded by Fujix
	03.MP3 (601,487 bytes) Dec 15, 2011, 20:02 Uploaded by Fujix
	04.MP3 (35,773 bytes) Dec 15, 2011, 20:02 Uploaded by Fujix
	05.MP3 (17,387 bytes) Dec 15, 2011, 20:03 Uploaded by Fujix
	06.MP3 (51,864 bytes) Dec 15, 2011, 20:03 Uploaded by Fujix
	07.MP3 (1,361 bytes) Dec 15, 2011, 20:03 Uploaded by Fujix
	08.MP3 (39,748 bytes) Dec 15, 2011, 20:03 Uploaded by Fujix
	e434089828.3_mod.jpg (244,784 bytes) Oct 24, 2020, 05:57 Uploaded by eito
	omote-4_mod.png (677,067 bytes) Oct 24, 2020, 05:57 Uploaded by eito
	poly800_msm5232_capacitors.jpg (1,158,567 bytes) Oct 25, 2020, 15:27 Uploaded by eito KORG Poly-800

No.18078 eito Tester Oct 24, 2020, 05:57	Hello, I have noticed this problem also and am willing to fix it. To fix this issue, further information of real PCB needed. Would you please take high resolution pictures of a specific part of real PCB ? The information required is, the capacitance of capacitors placed near the MSM5232. Please take a look of images attached. There is 8 of same capacitors placed there. They should have some numbers/letters on their surface that indicates the capacitance of them. We need some images with high enough resolution of them to confirm the content of the fix.
No.18087 eito Tester Oct 25, 2020, 15:29	For reference, I took a picture of a KORG Poly-800 PCB which uses a MSM5232. We can see that there are 8 of 1.0μF capacitors around the MSM5232 chip. MSM5232 uses the capacitance of these capacitors for envelope generation. The amount of decaying depends mainly on it. The current implementation of MAME specifies a value 1.0μF for flstory, and there is a comment that says this value is based on a real PCB. However, with this value, the playback doesn't match with real PCB. Other titles that use MSM5232 in MAME 0.225 use 0.39μF or 0.65μF for this value. The value 0.39μF is, a value indicated on datasheet of MSM5232. I can't found the source of the value 0.65μF. A comment written on msisaac(which uses 0.65μF) says that 'the value matches the sample, but it's not verified'. If the value 0.65μF specified for flstory, the playback sounds similar with your recordings. If the capacitors on real PCB indicates that they have capacitance of 0.65μF(or another value), then it can be proposable to use the value for flstory.
No.21040 TremiRodomi Tester 4 days ago edited on: 4 days ago	Coming in here to also confirm that the sound emulation is off compared to a real PCB. Playthrough of the game from a real PCB below. In addition, I also notice that what appears to be low-pass filtering on the AY sound effects, aren't present here. LEGEND OF GAME MUSIC 2 PLATINUM BOX also has PCB recordings of the entire soundtrack if you want a clearer isolated recording of the music as it should sound, which I sourced my own YT upload of the OST from (other than looping and some audio cleanup, it's the same as it is on the CD): https://www.youtube.com/playlist?list=PLqPqqf1AIs9R7DaB2eyZpBP-lAGiCdPJ7