I2S is the a protocol for streaming and seems like the best way to sample audio input.

• Instructables example code: Does this code handle multiple reads? How do we know when a buffer is full and it's time to re-read it?
• i2s full tutorial:does not address reading multiple times from analog input
• excellent video walkthru using analog read
• Arduino library that seems to do magic but documentation for analog read and multiple buffers seems scant
• Code from Google's AI bard that uses interrupts to know when the buffer is full. This is untested code.
  • bard offered these sources:
    • github.com/pion-labs/pion-educational-kits subject to license (MIT)
    • github.com/tanakamasayuki/Arduino_TensorFlowLite_ESP32 subject to license (Apache - 2.0)
    • github.com/eggfly/MusicCard subject to license (Apache - 2.0)
    • forum.arduino.cc/t/esp32-i2s-adc-read-two-inputs-possible/1032963
    • github.com/espressif/arduino-esp32/issues/4782

• Audio sampling with interrupts