Just a minor problem: I've noticed that the volume level of recorded jams (.m4a files hosted on the jammr server) is generally very low; on some devices it's quite difficult to listen to them (let alone dancing )
Doing some tests with audacity and the “amplify” effect, I've noticed I can usually amplify them by 10-15dB without clipping, so maybe you can tweak something on the server to have louder recordings?
(BTW the volume level of the video files posted on youtube is OK)