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Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-17, 13:58

kitrinx wrote on 2020-12-16, 21:03: I have not yet looked in detail at the SC-88. The control rom is in a significantly different format, and so I felt it's best to focus on one thing at a time. ok, I think then I can look at it and try to locate (at least some of) the things you located in SC-55 …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-16, 20:05

Sorry for confusion. Roland actually switches around terms throughout it's various documentation... many thanks for the detailed explanation! I will definitely reading it and re-reading it. I am still mostly focused in the last days on 94B format. Edit: Added the decoded three wave roms as well. So …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-16, 18:13

@mattw: will check adress line 17 after dinner no rush, take your time, you're almost there - it uses the same data value bit-shuffling as SC-55/SC-88. So, you didn't dump garbage data. However, it looks like address-lines are messed up, it seems to me something is wrong with address line: 1 0000 …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-16, 17:56

Ok, i red out the rom_a 3 times at very slow speed , red the output data 2 timers per adress and the attached file is identical to all read attemps. So the gabage will not be better. I will check the adress-line soldering, perhaps i mixed lines, but this should not be happened. :-( It's not total …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-16, 14:52

@kitrinx in VSC code (dissembled) the function that reads the structures of size 0xD8 is named GetToneNames(). So, I do believe what is described by those structures in Roland-terminology is called "tone". Also, that function calls another one named AssignVariation(). I have no idea what those " …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-16, 00:06

Edit: Added roms Woah, thanks for sharing these So, currently, there are MK1, SCB-55 and SC-88 dumps available. Soon, maybe SCC-1, as it was discussed here earlier. [EDIT] oh, I forgot those I found in the DLL, which are the latest from SC-88 Waverom series: https://www.vogons.org/viewtopic.php?p= …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-15, 23:56

A bit offtopic question. But does MKII wave rom differ from MK1? I once tried to desolder rom chips but ended up breaking chip legs, so I don't want to touch it again. It is different, although the same size. also, correct me if i'm wrong, but there are no dumps from a real MKII available - what we …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-15, 22:19

Please let me know. MS source code file is intriguing with that is says: Mix engines for Microsoft GS Synthesizer unfortunately, huge part of it is in Inline ASM. there is even comment in it: I don't know why // they wrote such convoluted code as they did above. Maybe it was fast. so, it's hard to …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-15, 20:59

There's still much to discover. I want to ask you about: // FIXME: Unfortunately after filtering twice the volume is extremely low, and the range // much too high and other such comments in the source code - do you have the same issues with the VSC sounds? have you tried? I know VSC sounds are only …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-15, 18:15

...it should serve as valuable documentation. many thanks! I will immediately utilize that information on my so far small attempt to understand 94B format. TVP and TVF as I do with TVA as far as I understand those are envelopes, that I guess answers why 94B has "EG1", "EG2" and "EG3", i.e. …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-15, 12:29

desoldered ROM's from SCC-1 + desoldered Control ROM I think you did good work with the desoldering - I see no damaged traces, etc. So, let's hope you can successfully read them. I do believe soldering them back will be actually easier than desoldering. In any way, after you read them I can …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-15, 08:57

I was a bit confusing. ... .... combined TVA/TVF envelope via sysex, and envelopes 2 and 3 are for TVA and TVF, respectively. many thanks for those details, since I know nothing about how synth engine works in general, those details help me to imagine fast what could possibly be going on and …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-14, 22:38

So, it seems based on the above other forum posts, not "GSSBK32L.94B", but "GMSBK320.94B" is the one that sounds indistinguishably from real SC when run on "Dream SAM 9407". Now, we can expect the sounds, I really think there has to be something to it, because I also found this: https://www.eetimes. …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-14, 21:46

I am kind of reinventing the wheel, because others came to the same conclusion: https://www.vogons.org/viewtopic.php?p=874340#p874340 that 94B and synth chips that support it are kind of "clones" of Roland synth engine. In any way, that is like double confirmation, that most likely pretty good …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-14, 19:36

it seems that comment made in "ISA SOUNDCARD OVERVIEW" list, that I quoted here: https://www.vogons.org/viewtopic.php?p=918599#p918599 not only applies to the sounds, but 94B format and synth chips that support it, look pretty Roland-centric in general, at least, to me. For example, small part of …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-14, 16:49

Sound Canvas has two LFOs. That's good. So, at least as number of LFOs ,94B format is suitable. It will really be good if someone can compare SF2 vs. 94B in regards to suitability for SoundCanvas banks, because @NewRisingSun mentioned here: https://www.vogons.org/viewtopic.php?p=913967#p913967 SF2 …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-14, 01:55

oh man, this is bottomless rabbit hole - after I guess few hours of research it seems 94B format is not public. Sure, it's possible to be reversed-engineered even I am not sure that I want to go that way, because I have no any knowledge how synth engines work in general. So, for example, I see 94B …

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