T-04YBSC-A, new YMF71x based sound card + SETYMF utility

Discussion about old sound cards, MIDI devices and sound related accessories.

Re: T-04YBSC-A, new YMF71x based sound card + SETYMF utility

Postby Bancho » 2018-8-11 @ 22:17

Hi Tiido - This is such a great project and i'm sorry your not able to see it further currently. When you get back to normal i'd love to pick one up especially for the Wavetable header!!

A quick question, i currently have a 719/704 card, would your software be compatible with it? This is my card

Image
Last edited by Bancho on 2018-8-11 @ 23:44, edited 1 time in total.
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Re: T-04YBSC-A, new YMF71x based sound card + SETYMF utility

Postby Tiido » 2018-8-11 @ 22:53

Thänk you for the kind words ~

It'll work as a generic YMF719 card to SETYMF due to reasons mentioned in my last post, the YMF704 is wired in a way that it is a MIDI expansion running off MPU401 of YMF719 while also replacing OPL3 of YMF719. It isn't an additional MIDI device and OPL3 to the ones already in YMF719. Some options will be hidden that are specific to my card but overall it works and controls all the things that can be controlled.
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Re: T-04YBSC-A, new YMF71x based sound card + SETYMF utility

Postby Bancho » 2018-8-11 @ 23:02

Thanks for the reply and i hope to have one of your cards in the future!

Also good work on the Mega Drive Audio from time ago! I'm sure i read about your work on Sega-16!
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Re: T-04YBSC-A, new YMF71x based sound card + SETYMF utility

Postby Tiido » 2018-8-12 @ 00:17

Hahaha, jaa, I'm TmEE on Sega-16. I actually have another sound mod cooked up but I haven't finalized it (been like that for years now lol).

I have also updated SETYMF, there was a cosmetic error. Version number was not shown correctly in the program itself, only on startup banner thing.
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Re: T-04YBSC-A, new YMF71x based sound card + SETYMF utility

Postby 640K!enough » 2018-8-16 @ 20:19

Tiido wrote:It is fully OPL4 compatible as ar as sound generation stuff goes. CPU can be turned off and you can directly access the registers and make sound that way but the sample ROM is completely different beast without any similarity to YRW801 that most YMF278 things use.

That was a bit of an understatement, actually. Looking at the chart in the datasheet, not only is the sample ROM smaller, but they have stuffed more instruments in. The YRW801 includes only the standard drum bank, while this appears to have the usual nine of them. I strongly suspect that they must have made some significant compromises to get everything into half the space, much like they did for the standard InterWave ROM. If that's all you've ever heard, it may not seem to be lacking, but when you compare one with the other, the differences can be striking. That was the situation when switching between the 1 MiB InterWave ROM and it's 4 MiB counterpart. They are "based on the same sample data", but you start to really notice the shortened loops and truncated percussion once you've heard the larger version.

This still bothers me: if Fat-Seal certification is supposed to mean that the volume balance and instrument characteristics will be similar across GM devices, why is there such a dramatic difference between certified instrument banks? If we take the Audiotrix Pro (the very first Fat-certified card) demo files (not the 44-voice ones) and play them on your card, a Roland and the Fat-certified InterWave bank, the sound will still be quite different, in terms of balance, etc. What, then, was the point of the whole Fat certification exercise?
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Re: T-04YBSC-A, new YMF71x based sound card + SETYMF utility

Postby Tiido » 2018-8-16 @ 21:26

There's only one drumkit, less than 128 unique melodic instruments and not many multisamples (most have 3 samples, only piano has one per all the octaves). Some instruments are made by playing two sounds at the same time (which will negatively impact polyphony) and some just apply different vibrato and tremolo. It sounds more noisy due to 8bit samples but there's no obvious short loops or other things along those lines, most samples have same sized loops as things in the more fancier things, nothing actually sounds outright bad here.

Fat certification, as much as I have heard of examples, means nothing much lol. Marketing thing it seems. I have plans to make a MIDI synth in future and there will be headaches around balancing things...
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Re: T-04YBSC-A, new YMF71x based sound card + SETYMF utility

Postby 640K!enough » 2018-8-17 @ 03:41

Tiido wrote:There's only one drumkit,

Really? I figured that, since they bothered to include the chart below in the datasheet, they actually had all of those in the ROM.
YMF721 Percussion Chart.jpg


Tiido wrote:Fat certification, as much as I have heard of examples, means nothing much lol. Marketing thing it seems.

I don't think it's just marketting, though that's probably a big part of it. I have read about "Fat Labs sessions", where a bunch of changes were suggested, and each time, testing had to be repeated. Adjustment of instrument parameters can get to be rather tedious business. Still, I would have expected the volume balance between certified banks to be closer than what I have observed.
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