PSG tone

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Start up Genesis Plus GX
2. Load Sonic & Knuckles
3. Listen

What is the expected output? What do you see instead?
PSG tone a little different. Carefully listen on 0:07 and 0:26. 

http://www.youtube.com/watch?v=T5a2-pq9jJI  

Compare to real Mega Drive, old GenPlus 1.3.1 very close.

What version of the emulator are you using (official, SVN revision,...)?
GenPlus GX 1.7.3 r764 and GenPlus 1.3.1

Please provide any additional information below (Emulator settings, Console
setting,...)

Both emulators run in Pal mode, with changed PSG volumes. (+2.30)

Original issue reported on code.google.com by Metal.So...@yandex.ru on 6 Apr 2013 at 11:22

[GoogleCodeExporter]

What PSG tone ? All i hear is FM tune and i can't hear differences in your 
video.

Original comment by ekeeke31@gmail.com on 6 Apr 2013 at 11:41

[GoogleCodeExporter]

I can not explain more precisely, but it can be seen as more rude part of music 
in the 26th second. In headphones it more noticeable.

Original comment by Metal.So...@yandex.ru on 6 Apr 2013 at 11:55

[GoogleCodeExporter]

Also in Regen v0.972 this difference more noticeable. 

1) Run this game in Regen emulator
2) In "sound" option choose "volume levels" -> SN76489 (PSG) 
3) Change it to 1.32
4) Listen intro music
5) Now reset game
6) Go to option "volume levels" 
7) Increase PSG from 1.32 to +3.50

And you will notice this rude part of PSG.

Original comment by Metal.So...@yandex.ru on 6 Apr 2013 at 12:09

[GoogleCodeExporter]

 If enable only one "FM Channel 0" this part will more noticeable.

Original comment by Metal.So...@yandex.ru on 6 Apr 2013 at 12:21

[GoogleCodeExporter]

What ? I don't get what you are saying, dude. You say that when you change the 
volume it sounds different ? And in the SAME emulator ? I think it's normal you 
know. You are limited by the depth of your audio output which is 16 bit 
normally so if you   hsetup to much gain for one stream (like psg) you may end 
up with clipping since all streams (6 channel fm and 4 channels psg) must fit 
in that 16-bit range

Original comment by ekeeke31@gmail.com on 6 Apr 2013 at 12:31

[GoogleCodeExporter]

And what has Regen to do with this ?

Original comment by ekeeke31@gmail.com on 6 Apr 2013 at 12:36

[GoogleCodeExporter]

Well, Regen and old Genplus 1.3.1 sounds same. But in new Genplus GX, i noticed 
what something changed and this change make emulator a little far from real 
thing. 

Original comment by Metal.So...@yandex.ru on 6 Apr 2013 at 12:41

[GoogleCodeExporter]

I change volume for search differences, because on normal levels, it really 
hard to detect.

Original comment by Metal.So...@yandex.ru on 6 Apr 2013 at 12:45

[GoogleCodeExporter]

How can it be "far from the real thing" and yet hard to detect at normal volume 
?
All i see here is a comparison between emulators (and like i said, i cannot 
hear the differences you say there are), not the real thing.
I tried the game on my PAL MD2 switched to 60hz and it sounds exactly the same 
as the current emulator version.

Off course there will always be people (like you) saying it's not "exactly" the 
same but I think that's because they are specifically looking for bugs or 
inaccuracies and indeed ends up hearing things. Because the truth is, no 
emulator will ever be perfect or sound the same when it comes to analog audio 
replication , even different md models sound different on that matter...

The digital part (sound chip) IS accurate and with default settings, it sounds 
close enough to my original console so for me it's accurate enough.

Original comment by ekeeke31@gmail.com on 6 Apr 2013 at 1:18

• Changed state: Invalid

[GoogleCodeExporter]

Okay if it accurate, i glad to hear it. I just not so "exactly" remember it. 
(from far 2003 year) 

Can you check another game on real hardware? Pirated rom "4-in-1 [p1][!].bin" 

1) Load rom
2) Run game from list
3) Exit in emulator menu
4) Load rom again
5) Repeat it until screen will be screwed like this: 

Original comment by Metal.So...@yandex.ru on 6 Apr 2013 at 1:38

Attachments:

• 19-30-34(06,04,13).png

[GoogleCodeExporter]

Could not reproduce it on my wii, it is probably caused by Dolphin sdcard 
emulation or whatever you are doing on your PC with Dolphin.

 I hope you understand that using a Wii emulator to test or look for bugs in a MD emulator running on Wii is not very reliable and i am not going to lose more of my time with this :-/

Original comment by ekeeke31@gmail.com on 6 Apr 2013 at 2:37

[GoogleCodeExporter]

Well, i checked atleast ~500 roms (all of them run perfect)

In basic windows port of Genplus, Wii features not included (audio preamps, 
overscan emulation, scaling and ability to move picture in any directions, etc) 
If PC users don't care about these things, here only one man who need it as air 
for live...

I don't want to use another emulators, because they can't give what i really 
want. Please, just add mono output, i sure it not take so much time. Try to 
understand me bro, my soul filled by pain. :(

Original comment by Metal.So...@yandex.ru on 6 Apr 2013 at 4:03

[GoogleCodeExporter]

just so you know, i already fully tested MD, MS, GG, SG romsets (as well as all 
released MCD/SCD games) to ensure 100% compatibility so you don't need to do 
this all over again, at least, I don't really  need anyone to do this, unless 
you are playing all games 100%  from start to end, which, honestly, seems a 
little bit crazy and maniac thing to do ^^

as for mono output, i will see what i can do, i guess an optional "mono" mixing 
would not hurt that much to add, it's really basic thing, just that, in my 
opinion, it adds CPU processing (and potential emulation slowdown) for 
something that won't change much your audio experience (stereo panning being 
not used so often by games and anyway, barely noticeable when you are focused 
on playing the games)

Original comment by ekeeke31@gmail.com on 6 Apr 2013 at 4:41

[GoogleCodeExporter]

Thank you. ^_^

Original comment by Metal.So...@yandex.ru on 6 Apr 2013 at 5:07