Problem with QjackCtl in ubuntu

Hey guys listen i have QjackCtl and works well, the thing is the volume of say firefox and renoise are not the same when running them at the same time.In QjackCtl execute script after startup i have put the following command pactl load-module module-jack-sink channels=2; pactl load-module module-jack-source; pacmd set-default-sink jack_out so i can have multiple audio apps running alongside without problems but when i watch a video in firefox the audio is like it is suppose to be but if i switch over to Renoise the audio is much higher.Any ideas?