Sonic 2 sound

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Load Sonic the Hedgehog 2
2. Play Sound Test 1D
3. Always sounds kind of scratchy...

What version of the emulator are you using?
Before audio changes.

Another potential YM2612 core bug has to do with the Sonic "Ring" sound 
(and similar sounds.)  The release of the sound seems too harsh and 
results in a clicking noise, especially when collecting many Rings.

Another potential YM2612 core bug has to do with the Sonic "Spring" 
sound.  It seems to waver. 

Original issue reported on code.google.com by westonl...@gmail.com on 4 Jan 2010 at 9:06

[GoogleCodeExporter]

Ah, scratch the "Spring" one.  I think it's just me listening too hard.

Original comment by westonl...@gmail.com on 4 Jan 2010 at 9:11

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This is a issue I used to notice in Regen with Sonic 1/2/3/Knuckles when 
grabbing
rings and hitting the bumpers. I guess the only way to check this one is to 
make a
recording from the real hardware and a recording from Genesis Plus GX.

Original comment by kingofch...@gmail.com on 5 Jan 2010 at 3:28

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A recording would bring the filtering of low-quality components into play, but 
I 
guess that's all we have, anyway. :)

Original comment by westonl...@gmail.com on 6 Jan 2010 at 1:59

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Well, if you have a model 1, you can take a 3.5mm male-to-male stereo cable and
connect it from the headphone jack of the Genesis to the line-in jack of the 
computer
and record it.

Original comment by kingofch...@gmail.com on 6 Jan 2010 at 5:27

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I was referring to the Genesis itself producing muffled sound.  But yes, I have 
a 
Model 1 "High Definition Graphics" Genesis.  A recording would require 
substantial 
effort (transplanting a desktop computer down a floor, etc.) because only it 
has a 
stereo microphone input (is line-in always stereo?)

Original comment by westonl...@gmail.com on 6 Jan 2010 at 6:55

[GoogleCodeExporter]

Low Pass filtering is part of the Genesis audio system and is therefore emulated
(more or less accurately) in Genesis Plus. Be sure it's enabled (60% low pass
filtering seems to be ok, compared with a Megadrive Model 2) because it sometime
"hides" harsh sounds and sounds more "natural".

I didn't have the occasion to test the sound you mention, will investigate on 
this
later but if the same sound plays fine during game, it's very likely it also 
happens
on real hardware (when you test a sound and press the button to start the note, 
it's
not synchronized with the sound chip execution)

Original comment by ekeeke31@gmail.com on 6 Jan 2010 at 9:22

• Changed state: Accepted
• Added labels: EmulationAccuracy, Priority-Medium, Type-Defect

[GoogleCodeExporter]

I don't like any filtering (more CPU time, right?) because I like to hear the 
crystal-clear edge of the FM sound, but I'll try it out.  Most games really 
sound 
great.  Some tests I like to use that tend to fail in other emulators but sound 
awesome in yours:

Zombies Ate My Neighbors (Konami screen)
Castlevania Bloodlines (BGM 26)
Phantasy Star II (SSG-EG in general sounds solid)

I'll see if I can get some recordings...

Original comment by westonl...@gmail.com on 6 Jan 2010 at 5:07

[GoogleCodeExporter]

For what it's worth, Fusion sounds just like Genesis Plus GX for the Sonic 2 
stuff, 
so maybe this isn't an issue.

Original comment by westonl...@gmail.com on 6 Jan 2010 at 5:17

[GoogleCodeExporter]

Yeah, after playing Sonic 2 on the real hardware, it sounds exactly like Kega 
and
Genesis Plus GX so I'm guessing it's correct in both. I need to find a copy of
Zombies Ate My Neighbors and do some recordings from the real hardware.

P.S. You can get a really long 3.5mm male-to-male stereo cord that can allow 
easy
recording of samples from the real hardware to a PC without moving it. There's 
really
cheap and long cables available at Radio Shack or Amazon.com and they work 
great.
Yes, the headphone jack from the model 1 is stereo where as the default output 
via
the RF or composite is mono. On a model 1, I use a video composite cable, and I
bought a 3.5mm to composite audio cable which allows me to have stereo sound 
through
my TV.

Original comment by kingofch...@gmail.com on 6 Jan 2010 at 6:36

[GoogleCodeExporter]

I tried Sonic 2 sound test and did not notice any issue with #1D, not scratchy 
at all
in my version (even with filtering disabled), this might be related to your TV 
setup,
I dunno. I will close this issue for the moment.

I'm glad you like the sound emulation anyway, I've indeed put a lot of efforts 
into
that, more than most users could imagine :-)

Original comment by ekeeke31@gmail.com on 6 Jan 2010 at 7:02

• Changed state: Invalid