we are getting there it just takes long time - not only for shipping that have huge delays because of covid but also because the software work is quite substantial. The original DOS drivers leave A LOT to be desired, even the mixer is sub-par. Sure drivers work for the simpler 4237 cards out there but once you aim for quality and advanced features there are many obstacles - most just boil down to lack of proper documentation and support/sdk tools.
A valuable partner in this is 640k!enough who provides software support and general testing - even found the most serious sound quality flaw that the previous beta had.
There a couple other cards floating around that we also gather feedback from, it really takes some people to test various things their way to really optimize things - and realize there are issues that you did not notice because your testing procedure is different.
For now the new pcb is like this, it has further analog/digital side separation, more filters, extra buffers, altered routing, different jack placement - in general a more optimized design based on feedback.
This project took way longer than expected - it's just that the optimization never stopped! 😀
Thank you all for your patience and support for the project!