Glitched music in some games?

switchblade · 13 August 2015, 03:58

I don't know if it's just me, but I have noticed some weird emulation issues when it comes to playing back music in certain games.

Two of the most noticeable ones for me are Lotus Esprit Turbo Challenge and Body Blows. In their respective intros, some parts of the music glitch out or do not play certain samples.

In Lotus, for example, the rapid drum beats at the beginning of the intro do not re verb properly, or get cut off very quickly. Some parts of the music later on seem to have this weird effect.

Same thing with Body Blows' intro music. Some samples in the music do not play back properly, or are muted.

Is it just me, or has anyone else noticed this?

StingRay · 13 August 2015, 08:41

Most replay routines use CPU dependent delay loops for the DMA wait hence on faster machines samples are skipped and/or not replayed correctly.

switchblade · 13 August 2015, 20:03

Hmm....

Is there any way to rectify this problem in WinUAE? This sound issue has been bugging me for quite a while.

StingRay · 13 August 2015, 20:10

Use cycle-exact A500 configuration.

switchblade · 13 August 2015, 20:30

I have.

Didn't really seem to notice a difference with either Lotus 1 or Body Blows.

Toni Wilen · 13 August 2015, 20:35

No config = can't help.

Fastest possible CPU modes enable hack that fixes most DMA wait bugs. (Without it most programs that use common music players would be unusable..)

It is also only enabled in fastest possible modes because it can break some other bad assumptions but "fortunately" those kinds of programs usually only work in more accurate modes anyway.

switchblade · 14 August 2015, 11:55

I guess I'll just post the current config I use in WinUAE...

It's mostly set up for OCS/A500 games only. Maybe you guys can take a look and see what I need to change?

Toni Wilen · 14 August 2015, 12:36

Config looks ok.

How do you know that music is wrong? Compared to real A500? (Anything else is invalid, including "I remember it sounding different"

)

switchblade · 14 August 2015, 12:48

I guess the only real comparison I can make is from listening the Lotus 1 title tune from Lemon Amiga, and comparing it to the emulated tune from WinUAE through this YouTube video here:

[ Show youtube player ]

Toni Wilen · 14 August 2015, 13:03

It does not prove anything. Not the first time video has been edited or ripped music played differently with game's player than with external player.

Retro-Nerd · 14 August 2015, 13:10

Lotus music recorded from a real Amiga (claimed). Same for Body Blows.

[ Show youtube player ]

[ Show youtube player ]

ReadOnlyCat · 18 August 2015, 06:53

Quote:

Originally Posted by StingRay

Most replay routines use CPU dependent delay loops for the DMA wait hence on faster machines samples are skipped and/or not replayed correctly.

I presume that these routines run in the main loop while the game logic takes place in the VBL interrupt so the routines are not really wasting CPU but still it boggles the mind that they would spend their time looping idly instead of preparing work for the next frame.

I mean, it's not as if Lotus III frame rate was so high they could afford to waste cycles

(I know this thread is about Lotus I's music but I sure hope they do not use the same routine in the III.)

13 August 2015, 03:58	#1
switchblade Registered User Join Date: Apr 2009 Location: United States Age: 37 Posts: 99	Glitched music in some games? I don't know if it's just me, but I have noticed some weird emulation issues when it comes to playing back music in certain games. Two of the most noticeable ones for me are Lotus Esprit Turbo Challenge and Body Blows. In their respective intros, some parts of the music glitch out or do not play certain samples. In Lotus, for example, the rapid drum beats at the beginning of the intro do not re verb properly, or get cut off very quickly. Some parts of the music later on seem to have this weird effect. Same thing with Body Blows' intro music. Some samples in the music do not play back properly, or are muted. Is it just me, or has anyone else noticed this?

14 August 2015, 13:10	#11
Retro-Nerd Missile Command Champion Join Date: Aug 2005 Location: Germany Age: 52 Posts: 12,449	Lotus music recorded from a real Amiga (claimed). Same for Body Blows. [ Show youtube player ] [ Show youtube player ] Last edited by Retro-Nerd; 14 August 2015 at 13:16.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Vector graphics games (ok, other games too...) with great INGAME(!) music?	dex	Nostalgia & memories	22	27 August 2011 15:57
I need MUSIC from few games ...	BOOGIEMAN	New to Emulation or Amiga scene	14	27 September 2008 16:52
Music that they should of put in games....	Jim	Nostalgia & memories	2	12 November 2004 14:07
Games that contain music like Turrican 2	whiteb	Looking for a game name ?	14	25 January 2004 21:22
Games music cd/k7	abelthorne	support.Games	15	13 December 2003 18:37

13 August 2015, 08:41	#2
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	Most replay routines use CPU dependent delay loops for the DMA wait hence on faster machines samples are skipped and/or not replayed correctly.

13 August 2015, 20:03	#3
switchblade Registered User Join Date: Apr 2009 Location: United States Age: 37 Posts: 99	Hmm.... Is there any way to rectify this problem in WinUAE? This sound issue has been bugging me for quite a while.

13 August 2015, 20:10	#4
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	Use cycle-exact A500 configuration.

13 August 2015, 20:30	#5
switchblade Registered User Join Date: Apr 2009 Location: United States Age: 37 Posts: 99	I have. Didn't really seem to notice a difference with either Lotus 1 or Body Blows.

13 August 2015, 20:35	#6
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,519	No config = can't help. Fastest possible CPU modes enable hack that fixes most DMA wait bugs. (Without it most programs that use common music players would be unusable..) It is also only enabled in fastest possible modes because it can break some other bad assumptions but "fortunately" those kinds of programs usually only work in more accurate modes anyway.

14 August 2015, 12:36	#8
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,519	Config looks ok. How do you know that music is wrong? Compared to real A500? (Anything else is invalid, including "I remember it sounding different" )

14 August 2015, 12:48	#9
switchblade Registered User Join Date: Apr 2009 Location: United States Age: 37 Posts: 99	I guess the only real comparison I can make is from listening the Lotus 1 title tune from Lemon Amiga, and comparing it to the emulated tune from WinUAE through this YouTube video here: [ Show youtube player ]

14 August 2015, 13:03	#10
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,519	It does not prove anything. Not the first time video has been edited or ripped music played differently with game's player than with external player.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)