Need help figuring out the pin out of this PCB

[davidlevy129]

I'm DIY creating a battery-powered rechargeable Bluetooth speaker and I have a old Bluetooth module from a Bluetooth adapter that I took apart. I took off the 3.5 millimeter Jack so I can solder some wires onto the PCB board but I just realized I don't know which contact is left right or microphone etc.

Thank you

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[Lojzek]

Get yourself a left/right channel test audio file and play it through.