11/7/2023 0 Comments Sequential circuits pro one yazooThe Pro One provided several alternate control modes. There was no way to edit or save a sequence. Note recording was by step entry only, and the duration of all notes was controlled by the LFO rate (or an external clock input). The sequencer was very simplistic it stored two sequences containing a total of 40 notes shared between the two. The arpeggiator could be "latched" in this mode, it would continue to play the current arpeggiation after the performer removed his/her hands from the keyboard, until switched off. The arpeggiator had two patterns: "up" and "up/down" (alternating). If no destination was connected to the mod wheel bus, the mod wheel did nothing.Īn arpeggiator and sequencer were provided. Each of these could be driven by the mod-wheel bus, the non-mod-wheel bus, or neither. Five destinations were available: the VCO A and B frequency modulation inputs, the VCO A and B pulse width modulation inputs, and the filter cutoff frequency modulation input. It allowed three signal sources - the LFO, the filter envelope generator, and the output of oscillator B (which was switchable to an LFO range) to each be routed to one of two modulation busses, one of whose overall level was controlled by the mod wheel, and one of which bypassed the wheel. One important difference was the "modulation matrix" section, which took the place of the Prophet's "poly mod" section, but served a similar purpose. The Pro One was packaged in a smaller case than the Prophet, with a three-octave, C-to-C keyboard and conventional pitch and mod wheels. The circuitry used the same Curtis IC's as the Rev 3 Prophet-5, and most of the controls were the same. Sequential tried to make the Pro One smaller, lighter and less expensive to build, while retaining the voice architecture and the basic sound of the Prophet-5, which was in demand at the time.Īccordingly, the Pro One's voice architecture was basically that of one voice of a Prophet-5, with two VCOs, a four- pole, low pass VCF, a VCA, two ADSR envelope generators to control the VCF and VCA, and an LFO. This was one of several efforts Sequential made to try to reach a market at a lower price point than that of the Prophet-5, which was quite expensive in its day. Sequential Circuits Pro One, courtesy of Ī monophonic, analogue synth produced by Sequential Circuits in the early 1980s.
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