Modular synthesizer - a frame capable of endless configurations and permutations, able to perform many functions. There were two major configurations in the Space Program: The white-noise generator based system, which was widely used on Space and also appears on Sei Miguel's The Tone Gardens (listen), and the current configuration, which is controlled with a ribbon position/ pressure sensor, joystick and theremin antenna. In this photo, the current setup for the Space Collective, with a digital delay and a smaller filter system (upper right), which are another instrument, the "Echo-feed" empty delayed loop.

Sample of Space Collective 2 on Space Collectives

Current configuration (oscillator-based, ribbon, joystick and theremin controlled synthesizer) featured on Space Study 4.

Appears on Space Elements Vol. I and on the forthcoming Space Solo 2 and Space Elements Vol. II.
Previous configurations appeared on Space (especially the white-noise based system - featured on Space Study 3 - but also the sawtooth pulse resonating bass and others).

 
Video of Space Study 3 live (theremin-controlled white noise modular system)