I have an Ultra++ on a raspberry pi 3 running the latest buster desktop distribution. I installed as per the instructions and can get output on onboard speakers and the headset and input from the onboard microphones. However, I’d like to get input from an external microphone. I am sure that the hardware works as I have gotten to work using a usb audio dongle on the pi and on a port on a Mac. I think the problem has to do with the setting of the mixer. However, there are a bewildering array of controls and I don’t understand what they do. I tried using some of the presets pointed to in the installation instructions both to use directly and to learn form. However, the results are inconsistent and I can’t quite figure things out. Part of the problem is that my device has the name seeed2micvoicec and the preset example files have outputs for a number of devices including wm8960soundcard (and some others).
Is there a description of what all the mixer controls do?
It seems that the relevant ones for the external microphone are ‘Left Boost Mixer LINPUT1 Switch’ (and corresponding one for the right channel) and the volumes for ‘Left Input Boost Mixer LINPUT2 Volume’ (and the corresponding right channel). However, the volumes also see to mute=1 set, and sending an unmute doesn’t work and sets the volume back to zero. I am using mixer cset commands to do the setting. Any idea what I am doing wrong?