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"The immensely popular Plan B Model 15 is an analog Voltage Controlled Oscillator (VCO) featuring an all-discrete component triangle wave core, two independent fully processed (+/-) VC inputs, a single 1V/Oct input, a dedicated linear FM input, sync, and independent Sine, Triangle, Saw, PWM and Wave Morph Outputs. The VC Wave Morph is a vactrol-based (read: smooth) crossfade function via a manual pot setting or VC control and the morphs from Sine to either Saw or Square wave outputs.
Due to it's triangle core architecture, the sound replicates that of the Buchla 258 with stability better than .01% (less than 4 hertz drift at 1kHz over 24 hours) and boasts a frequency range of 1 to 20Khz and a maximum power consumption of only 40mA.
Various component improvements on the Model 15 core have increased for 1V/oct tracking to seven octaves requiring only single pot adjustments for periodic calibration and none of the hick-ups associated with sawtooth core VCOs past the 3k limit.
The Model 15 has been mechanically redesigned with it's electronics resting parallel to the faceplate, bringing the overall depth from over 4 inches in previous revisions to less than 1 1/8th inches with the Rev. 2."
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