See Rule #4
Technically, there is not a single sound chip design which incorporates a CPU/processor, RAM (outside of streaming buffers), and DSP. The reason it will not be done is due to cost. The reason onboard solutions are popular is they are cheaper.
The best onboard sound chips still rely on the main CPU to do a lot of the work, and they also rely on system RAM for storage.
Can it be done? It could be, but it never will be. If it was going to be done, it would have already been done. It is simply cost prohibitive to do so.
Skuzzy agrees with me ....
Do not put words in my mouth. I was under the assumption we were talking about currently existing technologies, not pie-in-the-sky stuff.
I was not aware Gigabyte had discrete chip design capabilities either. Everything I have seen from them has been using off the shelf parts. I could be wrong here, as I have not contacted Gigabyte about it.
If you want a pie-in-the-sky discussion, then we can go down all manner of rabbit holes. For instance, there is nothing preventing Intel from building a sound device directly into the CPU. Although it makes little send to do so due to bus contention issues with the external devices.
Then again, the SATA controller could host a sound device, or maybe go back to an external memory controller with a sound device added in. The possibilities are limitless, as long as cost is not issue.