Yes and no. First of all, the Orchestron was not an “organ” and thus did not have an chord buttons- only a 37 note keyboard. Second, the actual track layout of the Orchestron discs differs from the that of Optigan® discs. With the Orchestron, Mike devised a track layout which was much more forgiving of crosstalk problems: he arranged adjacent tracks in harmonic intervals of 4ths and 5ths as opposed to the harsh minor 2nds on the Optigan® discs. The net result is that when you play an Optigan® disc in an Orchestron, you get all of the accompaniment loops scattered about most of the keyboard, with 17 scale notes scattered towards the bottom. Similarly, when you play an Orchestron disc in an Optigan®, you get the scale notes scattered mostly on the chord buttons, with some of them appearing on the lower part of the keyboard.