I restarted with a fresh installation of the 2018-08-06-raspbian-for-respeaker.zip image, while the 4 mic round pi hat does immediately appear in the Preferences/ Audio Device Settings/ as: seeed-4mic-voicecard (Alsa mixer)
The 4 mic linear boards do not appear as an Alsa device.
Is there any additional setup steps needed for the linear board?
Have any basic debugging hints?
(I am Not using the board for an Alexa device, only using some audio processing functions)
FYI Here are the 2 Respeaker related directories I could find in the Seeed provided system:
/home/pi/respeaker/
2mic
4mic_linear
4mic
6mic
ns_kws_alexa.py
ns_vs_raw.py
ns_kws.py
README.md
/home/pi/respeaker/4mic_linear/
aec_ns_kws_alexa.py
aec_ns_kws_doa.py
oa_respeaker_
4mic_linear_array.py
aec_ns_kws_doa_alexa.py
aec_ns_kws.py
kws_doa.py
(all files 08/06/16)
/etc/voicecard/
ac108_6mic.state
asound_2mic.conf asound_6mic.conf
wm8960_asound.state
ac108_asound.state
asound_4mic.conf
dkms.conf