Hi Pin, I apologize for my long delay in answering, it's been a while since I've had any time to tinker !
I have the following voltages on the Bluetooth module pins :
RX : 5V
TX : 1,26
VCC : 5V
Yes, the Bluetooth module is soldered, and yes, it was working at the beginning and I did my first recordings thru it, and there is still an HC06 Bluetooth registered in my computer connections.
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