Maestro USS-1 Universal Synthesizer System (s/n 1575, vintage, rare, by Tom Oberheim)

The Maestro USS-1 Universal Synthesizer System, developed by Tom Oberheim in the 1970s, is a pioneering analog effects processor that combines multiple sound-shaping modules into a single unit. Designed to enhance guitars, synthesizers, and other instruments, the USS-1 offers a range of effects that can be applied individually or in combination to create a vast array of sounds.

1. Waveform (Distortion)

The Waveform section introduces a distortion effect to the input signal, adding harmonic content and warmth. This effect is particularly useful for creating gritty, overdriven sounds that enhance the character of the instrument. By adjusting the Intensity slider, users can control the amount of distortion applied, allowing for a range of tones from subtle warmth to pronounced fuzz.

2. Filter and Sample & Hold

This dual-function module combines a filter with a sample and hold effect. The filter section enables users to sculpt the harmonic content of their sound by attenuating specific frequency ranges. The sample and hold effect introduces randomness by sampling an input signal at regular intervals and holding that sample for a defined period, creating stuttering, glitch-like sounds. This randomness can be applied to various parameters, such as pitch, filter cutoff, or modulation depth, adding evolving textures and rhythmic patterns to the sound.

3. Phaser

The Phaser module introduces phase shifting to the sound, creating a sweeping, moving effect. By modulating the phase relationship between different oscillators or sound elements, this effect adds a sense of movement and depth to your tone. The phase shift can be subtle or extreme, allowing for gentle, swirling modulation or dramatic, sweeping textures. It's ideal for creating lush, evolving sounds or adding dynamic quality to lead lines and pads.

4. Envelope Generator

The Envelope Generator controls how the sound evolves over time, specifically how it responds to note attacks and releases. With standard ADSR (Attack, Decay, Sustain, Release) parameters, users can shape the initial transient, sustain level, and how the sound fades away after the key is released. This control is crucial for creating dynamic, expressive sounds, whether shaping percussive hits, evolving atmospheric pads, or smooth, sustained notes.

5. Sub-Harmonic Generator

The Sub-Harmonic Generator adds depth and weight to the sound by generating a sub-octave harmonic to complement the original signal. This effect produces a low-frequency tone that is typically one or more octaves below the main signal, adding a rich, bass-heavy layer that thickens the sound. It's particularly useful for creating punchy bass sounds, adding fullness to leads, or crafting deep, atmospheric textures.

The Maestro USS-1's combination of these effects provides a comprehensive toolkit for sound design, enabling musicians to craft a wide range of tones and textures. Its analog circuitry imparts warmth and character, making it a valuable addition to any setup.

The knobs are missing, we sourced some after market ones but they are not a perfect fit and sit a little bit off-level. You get them for free with the unit. If anybody knows where to find the genuine ones, do let us know, thanks :-) 
Fully serviced and recalibrated. Works like a charm! 230 volt and EU plug.