Beagle
thanks guys! I think I will probably go with the camera system. good info!
bit - I tend to miss the doorbell even without headphones! ;-)
get a wireless system with 4 cameras.... use as many as you need in the studio rooms.... and put one near the front door and another on the driveway if you have 2 spares.... with them on the screen in a quad display, you will see the UPS driver pulling in and see him at the door.