As an owner of several Moog modular systems I can tell that they are very hard to find parts for . If you need an Oscillator , a filter , an amplifier , or a sequencer module , they are not easy to get . Once the Minimoog , MicroMoog , and MultiMoog came out the modular gear started to really slow down in sales . The smallest one is the System 15 . Compact and easy to move , good sounding too .