I am a newbie and just bought a Duet. I am trying to run my digital piano via line out to the Duet's input but do not hear anything on my monitors. I currently have both outputs (L/mono and R) on my piano to both inputs on the Duet. I know Duets outputs are working since I can hear sounds from my imac (i.e. YouTube) through my monitors. NEED HELP! Thanks! Korg SG-Pro-X digital piano, Roland DS-50A monitors, Duet, 27" imac, 2.93ghz quad core, 8gig Ram, 1TB HD.