Audio and USB-Audio with K210 for example MAix BiT

I need to read multiple microphones (>=4) with a high sample rate (more is better.

The MAix BiT offers the following but I am open to buy another board, preferable a RISC-V.

APU (Audio Processor) inside, support 8mics, up to 192KHz sample rate, hardcore FFT unit inside, easy to make a Mic Array (MAIX offer it too)

  • How do I connect the 8 mics?
  • Can I only use I2S mics which already did the AD sampling?
  • How can I use the connected mics on another device, preferable as USB-Audio like other devices handle it?