The MOTM-300 Ultra VCO represents a milestone in analog synthesizer design. Using only the finest available circuitry, the Ultra VCO has unmatched performance where it's needed most: stability and tracking. Using 4 separate temperature compensation servo loops, the average drift over 12 hours is typically 0.01% or about thirty times better than a Moog 921B VCO! Why do we call it the Ultra VCO? Because the tracking circuitry uses an ultra-matched differential pair transistor array that will hold over a minimum of 15 octaves! That's twice the range of a piano.

Although we put the focus of the design on stability, the MOTM-300 is indeed a 'full-featured' VCO. Sine, Saw, Triangle, and Pulse waveforms are all available simultaneously. PWM (Pulse Width Modulation) with initial pulse width and depth creates complex spectra. Other features include:

• Dedicated 1volt/octave input with military-spec 25ppm 0.1% summing resistor
• 2 separate Frequency Modulation (FM) inputs, each with it's own attenuator
• Linear FM with switchable AC or DC coupling
• PWM (Pulse Width Modulation) from DC to over 15Khz
• Hard and Soft sync option. Master Sync I/O jack.
• Low power consumption, only requires +-15VDC @ 60ma.
• All audio signals wired with coaxial cable for lowest noise and crosstalk
• Low-drift op amps and precision resistors used throughout
• 10 volts peak-peak audio outputs
• Frequency range from 0.2Hz to over 38Khz
• 2U panel width