Hello, I just bought a Presonus Firebox to record guitars, vocals and keyboard through Garageband. It all works great, except for a minor issue with the midi keyboard. All the software instrument sounds work perfectly, except the organ. When I play the keyboard with the instrument set to organ, there is no sound at all, but strangely it does record and there is organ sound on play back, but not when I'm actually playing. I've tried researching the issue and found this article: http://support.apple.com/kb/TS1083 This may be the answer, if only I knew what it means and where the settings are that need to be changed. Is anyone able to help guide me to the solution? Thanks.