Hi Marcel,
Please check my recording with the v2.0.6 firmware:
respeaker_lite_aec_test.wav.zip (2.3 MB)
Please open this wav file with audacity, split stereo to mono, and check the difference of the 2 channels:
The upper channel(channel 0) is the processed audio. You can find the cheer-up sound is almost gone and my voice is clear and loud.
The lower channel(channel 1) is one of the microphones’ raw data(sorry I remembered wrong before). You can hear what the speaker is playing loud and my voice is not very loud.