Re: Munt Reloaded - Development

Posted on 2011-02-27, 10:43

by

by sergm

in MT-32 Development

in MT-32 Development

0.9.2 released. It incorporates last changes in source as well as slightly lowered maximum volume to prevent overdrives. If overdrives ever experienced, it can helps just lowering master volume via the Front Panel interface. Just like for the real MT-32. It is not recommended to use DirectMusic …

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Re: Munt Reloaded - Development

Posted on 2011-02-27, 09:02

by

by sergm

in MT-32 Development

in MT-32 Development

Thanks for testings, Miki. This overdrive you observed most likely due to uncertainties of the max amplitude. Original Munt CVS stated that max amp = 155 (see tva.cpp) then master volume was subtracted transformed through a table. KG says this corresponds LAPC-I behavior and very different on MT-32. …

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Re: More accurate MUNT (MT32 emulation) patch

Posted on 2011-02-27, 08:48

by

by sergm

in DOSBox Development

in DOSBox Development

2 Ykhwong If you incorporate the library into DOSBox, sample rate probably must be set to 32000 Hz default as sounds best and CVS code tuned for this. Also I'm unsure about the parameter WGAMP (Amplitude of waveform generator). FIXME says its value is the amplitude possible whilst avoiding …

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Re: Munt Reloaded - Development

Posted on 2011-02-26, 11:32

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by sergm

in MT-32 Development

in MT-32 Development

After performing several tests on Munt I've found that: 1. Implementation of resonance values below 10 rather irrelevant. According to the D-50 docs 0 resonance produces waves without the resonance peak. Also, for high resonance values docs say that the signal itself fades, but resonance peaks grow. …

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Re: Munt Reloaded - Development

Posted on 2011-02-25, 18:25

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by sergm

in MT-32 Development

in MT-32 Development

Dominus wrote: ok, good luck with it then, just keep this in mind when you want to compare stuff. as you've written you have no real device. Year... the hardware in my hands would speed the things up greatly... But, hey, this is TEAM work, so it may be even better though...

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Re: Munt Reloaded - Development

Posted on 2011-02-25, 18:20

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by sergm

in MT-32 Development

in MT-32 Development

Dominus, the Munt codebase you've tested is not related with the project in subj. Probably you use Ykhwong's DOSBox build Feb. 19. 2011. It incorporates ScummVM codebase of Munt. I've started Munt Reloaded Feb. 23 2011 based on Munt CVS codebase which rather different and improved, and thus results …

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Re: More accurate MUNT (MT32 emulation) patch

Posted on 2011-02-25, 17:25

by

by sergm

in DOSBox Development

in DOSBox Development

2 Ykhwong I've added a patch for emulation of signal fading below cutoff point. That corrects volume somewhat. You can use it for your DosBox SVN build. By the way, the patch for DosBox can be slightly improved for better MIDI message timing. Now, the patch plays messages between DosBox mixer cycles …

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Re: Munt Reloaded - Development

Posted on 2011-02-25, 16:52

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by sergm

in MT-32 Development

in MT-32 Development

UPD: There is no difference in the signal in Munt when changing resonance in the range 0..10. Strangely... *EDT* This is because of formula resonance factor = 1 + (resonance / 30)^5 and thus resonance values below 10 are less then 0.01 and rather no matter...

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Re: Munt Reloaded - Development

Posted on 2011-02-25, 16:36

by

by sergm

in MT-32 Development

in MT-32 Development

The main target to improve is the wave generation and filtering algorithms. There are number of things to be checked: * Is the shape of the waveform really depends on the pitch. * How exactly resonant points influence the waveform. Is the resonance value 0 means no resonance at all. Just found that …

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Re: Munt Reloaded - Development

Posted on 2011-02-25, 16:26

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by sergm

in MT-32 Development

in MT-32 Development

So, after long awhile, the Munt Project has been revived. And the main reason for this is finding alternative concepts in order to get more precise emulation of the famous hardware module. Taking a look to the work completed by the Munt team, one may come to conclusion that it’s hardly possible to …

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Re: More accurate MUNT (MT32 emulation) patch

Posted on 2011-02-25, 16:19

by

by sergm

in DOSBox Development

in DOSBox Development

Done

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Munt Reloaded - Development

Posted on 2011-02-25, 16:16

by

by sergm

in MT-32 Development

in MT-32 Development

This topic for discussion of alternative approaches of Linear Arithmetic Engine emulation of the Munt Reloaded Project.

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Re: More accurate MUNT (MT32 emulation) patch

Posted on 2011-02-25, 08:56

by

by sergm

in DOSBox Development

in DOSBox Development

So, another reason for branching Munt is changing its concept. I'm seriously aware, that with the Munt approach of simulating the h/w precise sound simply isn't possible, or just too complicated to realize. Munt sources are full of empirical constants and things that need to be checked... In my …

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Re: More accurate MUNT (MT32 emulation) patch

Posted on 2011-02-25, 07:51

by

by sergm

in DOSBox Development

in DOSBox Development

maybe you could contact candacow and ask for being taken on in the munt team. Branching off munt is fine, but directly working on it and furthering would be good as well :) Well, I'm afraid, the Munt team has no time for this anymore, see Canadacow's post on this topic. And KingGuppy is the Munt …

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Re: More accurate MUNT (MT32 emulation) patch

Posted on 2011-02-24, 20:56

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by sergm

in DOSBox Development

in DOSBox Development

It works, thanks for your detail explanation. It's good to start with the latest CVS code from MUNT. Apart that it doesn't have the echo effect, it sounds weird in Police Quest 2. However, it seems faster and more stable. Freeverb that current Munt uses for reverb does not tuned for 44.1 kHz sample …

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Re: More accurate MUNT (MT32 emulation) patch

Posted on 2011-02-24, 08:43

by

by sergm

in DOSBox Development

in DOSBox Development

There are three things to consider. * /fmath directory isn't needed. * fpow2 function in fmath.h is too MSVC specific. (assembly part) It does not compile here. * Makefile.am needs to be refreshed for some compilers. Well, let me explain ... fmath.h was born in attempts to speed up those heavy math …

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Re: More accurate MUNT (MT32 emulation) patch

Posted on 2011-02-23, 19:57

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by sergm

in DOSBox Development

in DOSBox Development

Good to see someone willing/able to work on the driver. A [very] small point - within the readme there's the following: In the window that pops up, click "Browse..." and choose the directory to which you unpacked the oemsetup.inf and mt32emu.dll files. Click "OK". That should obviously refer to …

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Re: More accurate MUNT (MT32 emulation) patch

Posted on 2011-02-23, 17:21

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by sergm

in DOSBox Development

in DOSBox Development

P.S. In short, v. 0.9.1 released 2011-02-23 features: * It's Based on latest CVS code from Munt. This means precise pitch and modulation of MIDI playback. * I've overlooked using the complicated and performance unfriendly Blit algorithm for Wave Generation. Instead, i've used fast band-limited WG, …

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Re: More accurate MUNT (MT32 emulation) patch

Posted on 2011-02-23, 17:07

by

by sergm

in DOSBox Development

in DOSBox Development

Hi! It is very sad that nobody seems to continue developing of Munt, and even that CVS code never been released since 2009. Of course, there is gulikoza's build already, but in terms of performance and some sort of "thin" sound, it cannot be compared with 0.1.3 release, even for correctness of pitch …

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Re: MUNT and Vista/7

Posted on 2011-02-23, 16:53

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by sergm

in MT-32 General

in MT-32 General

Hi! I've got a quick solution for this. WinXP inf manager creates automatically inf-flie of new format and places it in %SYSTEMROOT%\inf\MEDIAINF\INF0.inf This can be placed in installation dir and used on Win Vista / 7 without a problem. x86 of course ;) Converted Inf is attached... -- Regards, …

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