You're welcome, lagerup.
Well, you should definitely get a mixer or an audio interface that has enough inputs for your needs.
Also: the Sound Editor from SoundTower is no DAW, GarageBand is. The Sound Editor just helps you do program your Pro 2 with the help of a computer and to organize multiple sound libraries, that has nothing to do with a DAW's job. If SoundTower will ever release an additional plug-in for the Pro 2 (just like they did for other DSI products in the past), you'll be able to control your Pro 2 basically like a plug-in from within your DAW.