Cannot get Maixduino to do the audio record and play

[myuunosuke]

I've tried the sample code listed here, "Routine 1" and "Routine 2" https://maixpy.sipeed.com/en/libs/machine_vision/image.html

I can run the code on my Maixduino from MaixPyIDE without any errors, but it does not play any sound. I was be able to record into a wav file and play it, so my hardware is still in working condition.

Does anyone know what causing the problem???

Setup:

• Maixduino with firmware v0.6.2 (custom built with speech recog enabled)

Test Code:
https://gist.github.com/myuunosuke/a2ab7e1242b97a70a7591ea479f10179

Thank you,