Hi, just only for checking and practice with the beamforming, I think you should start with interfacing your BlueCoin via Bluetooth with an external device (I use it with an Android smartphone, downloading the ST BLE Sensor app via Play Store). You can select "Beamforming" in the available menu, select the preferred direction, speak towards the board correctly rotating it in front of you and check the LED and the waveform screen. Quite the same if you desire to test the Source Localization app. This should work.
I see you are interfacing your BlueCoin via USB, acquiring the signal with Audacity. I'm not sure that the same data stream (already processed by the MCU according to the selected app) of the BLE is the same flowing through USB, or if the USB is more similar to raw data (btw, how can you select the desired direction for the Beamforming? Did you check if the LEDs are blinking?)... I should check.
Btw, which of the online available FW did you flashed on your BlueCoin?
