Hey, Yeah true, you need create channels manually, if you use external server. I just made good sql file, which you can execute example with this: https://sqlitebrowser.org
You need to back up murmur.sqlite file, and edit it then with that program that I just linked. Basicly you just need go to the execute page, and copy all rows in .sql file. The sql file is below.
mumble_channels.sql (21.3 KB)
Then you need to save it, and copy back to mumble server folder. That’s all! Works perfectly.