Wow. I had no idea there was an AceTone tape echo. I had an AceTone portable combo organ from about 1968 - 1972. According to the info at http://www.combo-organ.com/AceTone/ mine was the TOP-3 Phoenix. Rhythm Ace machines were sold by Hammond dealers who attached them to home model organs in those days. Years later a big-time instrument collector told me Ace Tone was the predecessor company to Roland. He considered Ace Tone organs to be the first Roland keyboards and therefore collectible.