Addictive Keys: Duo Bundle from XLN Audio provides a choice of any two virtual instruments from the Addictive Keys collection. These include a Steinway Model D grand, Yamaha U3 upright, Yamaha CP-80 acoustic-electric, and Fender Rhodes Mark 1 electric. The items can be selected and downloaded on registration from the XLN Audio website. The instruments all feature multiple microphone perspectives, presets, effects, and deep programming if required.