We just made a few changes to the game. Among them is a new item in the options page (http://www.jamlegend.com/options) to turn all 3+ note chords into 2 note chords. If you were previously having problems hitting certain chords like 345 this will solve the issue, although you will only get 100 points for the chord not 150.
We have also added a little surprise. If you play a few songs and are lucky you are bound to discover it. Enjoy!