Update cheatsheets

mumble

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mumble
+
+> Low-latency, high quality voice chat software.
+> More information: <https://www.mumble.info>.
+
+- Open Mumble:
+
+`mumble`
+
+- Open Mumble and immediately connect to a server:
+
+`mumble mumble://{{username}}@{{example.com}}`
+
+- Open Mumble and immediately connect to a password protected server:
+
+`mumble mumble://{{username}}:{{password}}@{{example.com}}`
+
+- Mute/unmute the microphone in a running Mumble instance:
+
+`mumble rpc {{mute|unmute}}`
+
+- Mute/unmute the microphone and the audio output of Mumble:
+
+`mumble rpc {{deaf|undeaf}}`