Where can I find the tutorial or demo of VoiceKey

OS (e.g. Win10): Win10
PsychoPy version (e.g. 1.84.x): 2021.2.3
Standard Standalone? (y/n) If not then what?:y
What are you trying to achieve?:
I found this on the official website of psychopy:
https://www.psychopy.org/api/voicekey.html
But I don’t know how to save the recording file