Abstract: There is disclosed an expression system for playback of a magnetic tape record rendition of a musical presentation. The detected intensity level for the bass and treble halves of the keyboard are assigned different data bit positions in the frames of recorded data bits of a time division multiplexed record system. The binary bits are weighted and used to modulate the width of pulses supplied to selected solenoids which actuate the striker-hammer members of the instrument so that the average drive energy applied to the solenoid is proportional to the desired intensity thereby more faithfully reproducing the manual action of the original performer.

Abstract: There is disclosed a system for demultiplexing and storing time division multiplexed frames of musical data encoded ina bi-phase mark/space code. Data in sequential groups of data bit cells is stored in a shift register while a counter counts the data bit cells. A plurality of latch circuits, each capable of storing one said group of data, are sequentially enabled to receive and store the data, in the groups, respectively. After all of the data bit cells in a given time frame are stored, they are simultaneously gated to transistor driver circuits for operating solenoids which, in turn, re-create the music.