The Minimoog Voyager Synthesizer is a monophonic (one note at a time) analog performance synthesizer. It incorporates virtually all of the sound resources and functions of the original Model D Minimoog, which was produced by Moog Music, Inc. from 1970 to 1982. It has many new additional features, including a three dimensional touch surface, MIDI IN and MIDI OUT implementation, extensive patching facilities, and a large number of new panel features. The signal path starts with a bank of three wide-range, high-stability voltage controlled oscillators, one noise source, and one audio preamplifier for externally-applied audio signals. The sound modifiers are two Moog filters and one stereo VCA (Voltage Controlled Amplifier). Modulation sources are two ADSR (Attack Decay Sustain Release) envelope generators and one multiwaveform LFO (Low Frequency Oscillator).Control devices include a 44-key keyboard with velocity and afterpressure outputs, pitch bend and modulation wheels, a three dimensional touch surface, and many control/pedal input jacks. The Voyager has a hinged, multi-position panel and a solid hardwood cabinet. The power supply accepts any power voltage from 100 volts to 240 volts.Oscillators Module 3 wide-range, high-stability VCOs (Voltage Controlled Oscillators) with continuously variable waveforms. FREQUENCY controls (2) vary the frequencies of Oscillators #2 and #3 over a +/-7 semitone range with respect to Oscillator #1. OCTAVE selectors (3) set the frequency ranges of the oscillators in six octave steps. WAVE controls (3) provide continuous control over the waveforms of the oscillators, from triangular, to sawtooth, to square, to narrow rectangular. 1-2 SYNC switch synchronizes the Oscillator #2 waveform to the frequency of Oscillator #1, for dramatic timbral effects. 3-1 FM switch provides linear frequency modulation of Oscillator #1 by Oscillator #3. 3 KB CONT switch disconnects Oscillator #3 from control by the keyboard, thereby enabling it to function as a drone. 3 FREQ switch lowers the frequency of Oscillator #3 into the sub-audio range, thereby enabling it to function as a low frequency audio or modulating oscillator. Mixer Module Five-input mixer for combining the audio sources prior to filtering. Input Level controls (5) adjust the relative levels of the oscillator, noise, and external audio input signals. Input switches (5) enable the player to quickly switch individual audio signals in and out. External Level LED enables the player to set the correct external audio signal level. Filters Module Dual mode filter module includes dual lowpass and highpass-lowpass filtering. Dual lowpass mode consists of 2 Moog lowpass-resonant filters in parallel, one per output channel. Highpass-lowpass mode consists of Moog lowpass filter in series with a highpass filter. CUTOFF control sweeps the frequencies of both filters throughout the audio range. SPACING control sets the spacing between the frequencies of the two filters, over a +/-3 octave range. RESONANCE control adjusts the resonance of both filters, from none (pure lowpass response) to filter oscillation. KB CONT AMOUNT control sets how much the filters open and close as the player presses different keys on the keyboard. Dual Lowpass/Highpass-Lowpass switch selects between dual lowpass operation and highpass-lowpass operation. Envelopes Module The Envelopes Module generates two wide-range ADSR (Attack Decay Sustain Release) envelopes. The Filter Envelope sweeps the filter and is available for modulation shaping. The Volume Envelope shapes the overall volume. ATTACK controls (2) determine the attack times of the envelopes. DECAY controls (2) determine the decay time constants of the envelopes. SUSTAIN controls (2) determine the sustain levels of the envelopes.