I'm designing an enhanced clone of the GUS PnP - which can do everything a GUS ACE can.
You're roughly a week too late tho for the first batch. Meanwhile try eBay.

Damn, too bad for the first batch. On ebay it's really overpriced. I've just see your project and i'm really interested.

I continue to keep an eye out for an GUS-ACE for you. Just drop me a message here on Vogons, so I don't forget "who asked what at what point".
If you by any chance had a full GUS (classic or max), then I would advice you to hold on to it and forget the ACE.
The only advantage it has, over real gus's, are that the ACE have line-through, meaning that you will not have to battle swapping cable's.
Anyway... Drop me a line, so I can remember that you asked, and I will report any cards for sale that I come across.
If I know were you are living on the globe, then I have a better "window" of finding the right card to report back to you about.

Gus ace is pure sound card, it has no silly IDE and sound recording capabilities. It is big advantage over classic and max, especially is multi sound cards setup

The only major advantage of the ACE is that you can disable the AdLib ports - something you can do with any InterWave based card.
Also no sample rate drop.

I haven't had any trouble with the Adlib ports with the Classic. I think it's pretty much the same thing as the ACE. It does actually have a physical joystick port that you can enable or disable, instead of the ACE's 'virtual' one. 🤣

Haven't had any trouble with my ACE, regarding the joystick port.
On the other hand, I have not had a use for joysticks the last 15 years or so.
I can only speak for any conflict's that might affect the rest of the computer.
And I have not found any setup conflicts what so ever with an ACE and a SB16.
(Or any AWE cards eighter)

The only issue with the ACE, that I have come across, is in Fasttracker2.
If the files are bigger than aprox 425kb, the ACE has some trouble.
This is purely because I don't have more than the standard 512kb mem.
What strikes me as odd, is that any SB16 cards, works with +512kb files.
As the SB16 really do not have any mem, it must be the way FT2 is made.

On the other hand. FT2 is great on a AWE64-Gold, bacuase of the RCA plugs.
On all other Soundblaster compatible cards with Jack, FT2 runs just about the same.

I can't follow your FT2 argumentation.
The ACE is treated as wavetable device with its own RAM. If you have 512 kB you can load 512 kB of instrument samples in theory, but this gets reduced due to padding to 256 kB memory boundaries. So 425 kB used seem to be quite reasonable.
SB16 is a pure player device with the instrument in the computer RAM. No limit to 512 kB, no padding so it works easily with instrument samples that are more than 512 kB in summed size.

This is why i want a ACE card ... i will arleady have a good opl3 sound card ... it's will be the best of the two world.

Upgrade your ACE to 1MB with one 256K x 16 80+ns FPM 40-pin SOJ DRAM. That will fix any program expecting more than 512KB of sample RAM.

Use Ultrainit v2.26a and nothing else to disable the ACE's joystick port properly. I wish it did have a joystick port, the port on the SB Pro is not reliable at fast 386 speeds and above.

The GUS ACE is not a PnP card, the Interwave-based cards are. It is also the smallest GUS by far, it does not extend past the ISA card connector and it will fit in tight cases. It does not need compatibility software loaded for certain games.

I'm asking mylself what it's better between the creative ct2290 or the Clone Yamaha OPL3-SAx as my main soundcard.

Simple answer: The clarity and definition of the FM sound from the Yamaha OPL3-SAx (718, 719 series) is way superior over most (if not ANY) Creative card with a real OPL3 (no CQM) FM circuit.

So the A151-A00 with the YMF718-S should be a agood choice with a GUS ace.

I'm open to any GUS/clone ...