the roland p-330 digital piano module was released in the late '80s. the p-330 attempts to do all the mks-20 digital piano module can do, and more, all in a light weight one rack space package. the p-330 is extremely similar to the mks-20 featuring eight distinct digital tones: three pianos, two electric pianos, clavinet, vibraphone, and harpsichord. tone can be stored in the sixty four patch locations. parameters include a two band eq with parametric high and low, chorus type, depth, and speed, and vibrato type, depth, and speed. chorus and vibrato on/off status can be stored with each patch, along with transposition. the chorus has several waveform types