I am running EarMaster 5 on Mac OS X Lion and since upgrading to Lion (10.7) the sound level coming from EarMaster has dropped to a ridiculously low level. ;-(
I can still use the program through headphones and turning the volume level of my headphone jack up but I thought it would be nice to inform you of this issue. I never had this problem while I was running Snow Leopard (10.6).
Could this be looked into and see if a fix can be found. Other than that this is an excellent little program which has been a great help in developing my ear so keep up the good work!!