As you saw in my previous post I figure-out that my audio mixer was using a MVSILICON BP1048B2 microcontroller.
This chip uses the Andes NDS32 architecture internally. More specifically it is a NDS32 V3S MCU.
After posting about it on Twitter my friend @atc1441 find out the repository and discovered that is using some kind of SWD for programming:
Then searching in the Internet I found that there are other chinese chips using this same NDS32 architecture on MCUs, for example the powerful offline audio recognition chip Unisound US516P6: