An instruction machine employing a multi-track (two channels on each track) tape recorder wherein analog instructions are recorded on one channel of a tape and control signals are recorded on the other channel. Control signals perform a number of functions and are recorded on a tape responsive to operation of a digital keyboard. Typically, an instructor would record a lecture on one channel and control signals (e.g. for reproduction of material recorded elsewhere) on the other channel, the control signals being positioned opposite points in a recorded lecture where some equipment control is desired, e.g. for providing supplemental displays or continuation of the lecture on another track. For example, a student might be questioned and the student required to indicate his answer by operation of the keyboard. If the student's answer did not display certain knowledge, represented by the selection of a correct answer coded on the control signal channel, the tape transport would be caused to move to a different track and field position on the tape to reproduce certain other lecture material in order that the student be given particular additional instruction.