Mumble audio input on Raspberry Pi
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The Raspberry Pi does NOT have any audio input hardware unless you have a USB microphone or USB headset/microphone or a USB sound card with a connected headphone.
Don't be fooled by the little "audio" jack on your Pi because it generates ONLY audio OUTPUT.
Accordingly, if you install Mumble on a Raspberry Pi without any additional USB audio hardware, you can HEAR others speaking on Mumble, but you won't be able to send any audio in response. You'll be forced to respond with text via LAC's Morse Code Radio. (The other option, of course, is to install Mumble on your phone or tablet. Android and IOS both have Mumble-compatible apps for this. I have extensive experience with "mumla" for Android and I recommend it as a practical alternative.)
Update 13Aug2020: I bought a low-cost USB microphone and confirmed that Mumble and LAC work properly with it. I found it on Amazon by searching for "Microphone for Raspberry Pi", and I only had to pay U.S. $7.00 for it.
I used Mumble's "Audio Wizard" to configure auido input for use of that new USB audio microphone device. The process was fairly intuitive in the way it offered me a comprehensive list of audio device candidates. I worked my way through all of the devices with names that seemed to make sense until I found the one that works.
My voice wasn't very loud through that little USB microphone until I used a USB Male/Female extension cable to move it closer to me. When I carefully speak directly into it, others can hear me reasonably well.
Now my little Raspberry Pi supports every feature expected by members of the growing little LAC community!
Last edit: bbosen 2024-01-26
All of the Raspberry Pi models that are powerful enough to run LAC (Pi4b, Pi5, Pi400, and Pi500) include support for bluetooth audio, so you have the additional option to use a bluetooth headset. This includes support for a bluetooth microphone. Once your bluetooth headset & microphone are working with your Pi, you'll be able to hear and speak through mumble.