![]() The Pro One was basically Sequential's attempt at taking their legendary Prophet 5 poly-synth and packing it into a compact, inexpensive, monophonic analog synth It has two VCOs, a great 4-pole lowpass filter, two ADSR envelopes (one for filter), and a compact three. Next up I’ll be replacing the missing mod wheel, the broken potentiometer, and the missing knob. It comes from the same period and genre as the Roland SH-101 and Moog Prodigy. Its monophonic voice architecture was modeled after the Prophet-5 Revision 3 and Prophet 10 by incorporating the exact same VCOs, VCFs, VCAs, & Envelope Generators. After all that I tested it again to find it working flawless, although still a little difficult to tune. The Pro One keyboard was introduced at the 1981 Winter NAMM Trade Show by Sequential Circuits as the worlds first synthesizer for under 1000, carrying a list price of 745. I also bent the J-wires slightly to improve the tension. I used used q-tips with a drop of LPS-1 to clean each J-wire and the metal bar that they connect to when the key is depressed. Another problem is that the J-wires can become less springy, making the connections a bit weak. For a close up view of the Pro-One J-wires check out this post on MaxtrixSynth. The Pro-One uses a J-wire keyboard with open air connectors that are prone to collecting dirt (or residue from malted beverages spilled over the keys). The knobs no longer had anymore crackling going on, so that was fixed, but the keyboard was horribly inconsistent. I put the thing back together and did some tests. After applying the LPS-1 I made thirty or more rotations of the pot from zero to maximum so that the dirt particles were worn away by the fluid. ![]() The stuff works wonders on crackly volume knobs and was recommended to me by the electronics experts at AEI Electronics in Minneapolis years ago. To clean the pots I removed the knobs and then squirted a few drops of a greaseless lubricant called LPS-1 around the post. In other words, I wasn’t diverted by dirty dishes. For you laymen, pots is short for potentiometers. ![]() The first thing I did was clean the pots. At some stage one of the knobs was broken off and lost, leaving a stub of potentiometer protruding uselessly from the control panel. Over time the key contacts became dirty and inconsistent. Once I started using the Korg MS2000, I neglected the Pro-One and it fell into disrepair. My plan is to get it as close to mint condition as possible and start using it again for recording and perhaps performing. if any of your other keyboards can supply these CVs then you should be able to control your Pro One directly from another keyboard without the need of a MIDI to CV converter.Įmail for options that include MIDI kits and enhancements to your Pro One's on-board sequencer and arpeggiator.I have finally started restoring my Sequential Circuits Pro-One. ![]() The Pro One operations manual states the CV IN requires a 5v GATE and 1 volt/octave CV (0-10v range). However, if you choose to continue to use a membrane switch keyboard, the rubber keystops are the same for all Pro One keyboard, whether J-wire or membrane switch style. At this time a MIDI to CV converter is the easiest solution to by pass a membrane switch keyboard keyboard and trigger a Pro One. In the past any successful repairs to the troublesome membrane switch contacts were only temporary at best due to the inherent unreliability of the switch design. It also syncs to MIDI clock and external audio input, and inputs/outputs control voltages. With 16 tracks, 16 steps, and 4 phrases, it features both real-time and step input, ratcheting, variable gate and sequence lengths, multiple playback modes, and paraphonic operation. Original studio samples converted to 160kbps mp3’s for player. The Pro-One was released in 1980 by Sequential Circuits Inc., of U.S.A. Although any Pro One can use either a J-wire style or membrane style keyboard, the probability for finding a replacement J-wire keyboard is very unlikely since they only exist in other Pro Ones. Possibly the Pro 3’s most powerful performance tool is its sequencer. The Sequential Circuits Pro-One is a monophonic analog synthesizer.
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