Every sound of the TR-707 and TR-727 has been faithfully reproduced using the original PCM wave data and detailed models of the original circuitry. Analog Circuit Behavior captures the unmistakable sound of the original units—a result of lo-fi sampling and the behavior of the analog envelope and VCA circuitry design.

All 30 original TR-707 and TR-727 sounds are included, each with Tune and Decay controls. The 7X7 expansion also includes new, never-before-heard sounds inspired by the original TR engineers. New TR-808 'noise' sounds and finger snaps bring ever more tonal variety, and newly modified TR-909 kick and snare sounds take the classic combo into new territory with enhanced attack characteristics. The flam and accent behaviors of the TR-909 and TR-707 are featured as well, with adjustable flam intensity and two levels of accent.

This new expansion upgrades the TR-8 to have all the sounds and articulations of four iconic TR drum machines, plus all new sounds, in one performance-ready instrument.