This piece uses Messian’s modes of limited transposition as a point of entry to examine how traditional piano sonorities can be successfully combined with digital signal processing. Messian's modes of limited transposition are a series of scales that have only 2-3 transpositions possible for each scale before returning the same note series. In this piece one mode is used for each hand in the piano, and an additional mode is mapped on to a spectral filter allowing for the computer to 'intrude' upon the piano part with a different limited transpositional mode. It does this by applying a spectral filter tuned to one of the modes onto the recorded or live piano performance. The piece was performed at a composition seminar at UC SantaCruz in December of 2010.