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Make the RPi connected to the audio system essentially a bluetooth speaker. Stream the audio from the RPi that's playing back the video. Most video player apps have sound delay/advance configurable. - once the audio delay/advance is set for a particular video it should hold audio sync throughout playback pretty well.
From tutorial at Raspberrypi.org forum ...
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The problem might be the SD PIN. I would try to run the speaker test:
https://learn.adafruit.com/adafruit-max98357-i2s-class-d-mono-amp/raspberry-pi-test#simple-white-noise-speaker-test-6-1
while adjusting the voltage according to the given parameters:
https://learn.adafruit.com/adafruit-max98357-i2s-class-d-mono-amp/pinouts#sd-slash-mode-2-15
to see if ...
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I did some more research and did manage to get the MEMS mic working.
Apparently the guide was updated after I did setup my RaspberryPi using the guide which Johnny789 did point out in a comment.
https://learn.adafruit.com/adafruit-i2s-mems-microphone-breakout/raspberry-pi-wiring-and-test
This page (Raspberry Pi Wiring & Test) was last updated on Nov ...
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If you can afford the space always go for the CD quality. It otherwise has very poor quality on the RPI. I've tried many USB microphones of varying quality including Blue Snowball and all have this background static sound to some degree unless you use record at CD quality as shown in the Greenonline,FishFace post:
arecord -D sysdefault:CARD=1 -d 10 -f ...
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Use Putty to login to your Pie User = root Password = root
At the terminal cmd prompt type
nano /storage/.config/autostart.sh
This will create a startup file
Inside this file type in
amixer cset numid=3 1
Use ctrl+x to exit the file then Y to save the file.
Reboot and your sound should now be coming from your audio jack every time you startup Lakka
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