Dude, that's sick! Been thinking about ditching Discord for a while now. Any tips on where to start with setting up a Mumble server? And how's the cost compared to just using Discord for free?

Costs aren't bad - really depends on your server capacity. If you're looking for a small group, a t2.micro on AWS is free for the first year, then pennies per hour after. If you need more juice for more ppl, might look at t3.medium, that's gonna be a few bucks …