Strange that the J-wire is thought to be the preferred option as, thanks to its simplicity, it is at least easy to fix, and fix you will need to if you have one that you use regularly. Well it could, I’m afraid, and Pro-One keyboards have gone down in history as being pretty unreliable and liable to degrade with time. “Surely it can’t be that crude and simple?” I asked myself. When I discovered this design, I had to stop and scratch my head for a while. There it stayed for about 10 years, until the owner decided to sell it on to me: at which point, I began to fully understand the build quality as it required a little maintenance to get it going.Įssentially, by pressing a key down, the wire under the key makes contact with another wire that runs along the length of the keybed, hence completing the circuit. Some years ago, I was working with a friend of mine, from a well known and successful indie band, and while assisting in some studio maintenance-style duties, noticed a lowly Pro-One in the store, looking unused and up-ended. Given the affordability of the Pro-One, something had to give, and it’s no surprise that the build quality of the Pro-One came in for a lot of criticism, and was nowhere near the polished finish of the Prophet-5. Produced from 1980 onwards, the Pro-One is thought to be the first professional-grade synthesiser that hit the ‘below $1,000’ price point – which it did by quite some margin, initially selling for $645, but rising swiftly to $745. So you could question the decision to make a monophonic version of the Prophet-5, which is the over-simplified description of what the Pro-One represents. External audio in can also be used to generate a gate signal.This company saw the rise of synth legend Dave Smith – the SCI name emanated from the first run of products, which largely focused on sequencer or drum-machine designs, but the groundbreaking SCI synth came in 1978, in the shape of the Prophet-5.Ī five-voice analogue synthesiser which had patch memory allocations, it was the answer to many keyboard player’s dreams in fact, a friend of mine who was a gigging session muso from that time cites the Prophet-5 as being the only machine that was needed back then, as it pretty much did everything that was required. The back panel has audio out, external audio in, and CV/gate in and out. There are two modulation busses, one is direct (non-attenuated) and the other can be attenuated by the mod wheel. There are controls wheels to the left of the keyboard which are pitch bend and modulation amount. The glide can be switched so it only glides when you press a key before releasing the previous key. The Pro-One has a 40-note dual sequencer with a volatile memory (the sequence is lost when you turn the instrument off) and an arpeggiator. These sources can modulate VCO1 frequency, VCO1 pulse width, VCO2 frequency, VCO2 pulse width, or the filter. The available modulation sources are Filter Envelope, VCO2, or LFO. There is a filter input control which is a mixer for VCO1, VCO2, and noise or external audio in. The VCF has controls for frequency cutoff, resonance, envelope modulation amount, and keyboard follow amount. The VCF is 4-pole lowpass and will self-oscillate. The Pro-One has two envelope generators (ADSR), one for the VCF and one for the VCA. The LFO can output a sawtooth, triangle or a square waveform and can be set to retrigger on key press. (VCO1 and VCO2 are actually called "VCOA" and "VCOB".) VCO2 is switchable between sawtooth, triangle, or pulse waveforms (any or all) and has a switch to disable keyboard control. VCO1 is switchable between sawtooth and pulse waveforms (either or both) and can be synced to VCO2. The Pro-One is a monophonic, two oscillator synthesizer with a 3 octave, 37-note (C-C), keyboard. Sequential ad featuring the Pro-One, courtesy of Benjamin Ward Search the Classifieds for this instrument. (remote controller keyboard for the Prophet-5) Six-Trak Split-8 Prophet-3000 Prophet-T8 Prophet-VS Remote Pro-8 PRO-FX Pro-One Prophet-5 Prophet-10 Prophet-600 Sequential Circuits Instruments Drumtraks Fugue Max Multi-Trak Model 800 Home Site Map About Us Contact Us Support Us
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