I used to be a professional musician and recently decided to get back into doing some demo tracks. I have an fully loaded MacBook Pro with Garage Band. I took the GarageBand course, bought a little M-Audio Keyboard and procuced two original tunes; great! Now however, I want to go a bit further so I went into B&H Electronics in NYC and bought the Tascam (model above). The sales person told me that I would be able to plug my Yamaha and Kruzweil keyboards into the unit and that the voices from these instruments could be recorded into GarageBand. Same with the microphone and my harmonic decoder. So far, the only thing I have bee able to do is record my Ovation Guitar. I cannot get the device to recognize my keyboards or my microphone. I am ready to return it. Does anyone out there have any experience on how to make this device work? Thank you for your responses.