I'm from Austria, 28yrs old, musician.
This is my first impression (short version):
1. I guess the “Send” Button has something to do with send proper sound to others ? Why don't you name it “Mute” ?!
2. to join another jam, I have to disconnect current jam, then connect again to see “main menu”?! There must be an easier way. Something like an backward arrow in the upper corner
3. Thank you ! I love Jammr You did a great Job!! If u need any kind of help to promote this thing, I will do my best !!!