![]() Especially in the first two years – 19 – this great monophonic synthesizer was manufactured non-stop, with an output of up to 50 pieces a day. Therefore, it had to be assembled with just a few quick steps. The Pro-One was designed, manufactured and sold as an inexpensive instrument. If you look at the innocent simplicity with which Sequential accommodated the inputs / outputs on the main board and from there (via holes in the housing) to the outside, you wonder why the company didn’t invest in 7 spindle nuts as binding (and stabilizing) elements. Since a Pro-One with stabilized potentiometers is a lot more comfortable to operate (and also looks much better!), you will hardly want to revert it back to its original condition.Īnother – even simpler – modification is the rear stabilization of the Pro-One metal housing. In most cases, removing the pasted washers won’t be an option anyway. Caution is advised! Take your time – work slowly and precisely. Once glued on the Pro-One, the washers cannot be easily removed – at least not without leaving stubborn residues. ![]() Ideally this should be done with light pressure against the potentiometer axis at the moment of sticking, in order to alleviate the wobble factor (the original problem) once and for all. ![]() Of course, such a modification needs to be considered carefully, since you have to attach the washers to the panel with glue (superglue?). To the contrary: The washers and the aluminum knob caps (mentioned in part 2 of our trilogy) contribute to a coherent overall impression of the instrument, above and beyond the stability that is gained. Assuming the diameters of the washer and the knob match, this modification is not detrimental to the appearance of the Pro-One. This problem can be tackled very easily with washers. Fastened directly to the (one and only) large main board, they are not screwed to the panel and therefore lack stability. One of the few unpleasant aspects of this instrument is the instability of the pots. So, finally, to our two last suggestions, which again concern the hardware of the Pro-One. The company offers a Pro-One retrofit kit that can receive pitch bend / mod wheel / filter cutoff frequency and sustain MIDI values (with a range of a respectable 60 notes). Kenton Electronics should also be mentioned. In addition, the Pro-One keyboard can be used to play other MIDI synthesizers polyphonically (!) … Plug-n-Play! No soldering required!” For another option, Music Technologies Group offers a MIDI kit (IN / OUT), in which, as a special feature, the Pro-One arpeggiator / sequencer is MIDI clock syncable (MIDI IN) and can transmit its data to the exterior (MIDI OUT). “The MTG Pro One Turbo replacement CPU Module is a drop-in replacement microcontroller for the Sequential Circuits Pro One’s 8021 CPU (AKA P8021/8021H/P8021H). It is not surprising that the sequencer can only store a maximum of 40 steps and that it immediately loses its memory when the instrument is switched off.Īn upgrade brings some light into this digital darkness: Music Technologies Group (MTG) is the manufacturer of a CPU which not only extends the Pro-One sequencer memory to 256 steps, but also ensures that sequences are retained after the instrument is switched off. There is the ROM and RAM area of the Pro-One, for example, which is tiny. From today’s perspective, the computer-technical facts of this 1981 synthesizer are ridiculously elementary. The provider not only offers side panels for the Pro-One (and a complete Pro-One wooden case as well), but side panels for a large number of synthesizers – from the Korg Mono/Poly to the new Behringer vocoder … One company in question is based in London / UK and can be found on : Mint Case. Strictly speaking, any experienced craftsman musician could manufacture them himself, but entrepreneurs / professional carpenters often have better access to noble woods. These may be had not only in the USA, but also in Europe. The material for the latter can be purchased in any hardware store for a few Euros, and lend the Pro-One a higher degree of stability …įirst, however, an after-thought on the side panels of the Pro-One. Part 3 of our Pro-One upgrade trilogy provides hints for a new CPU, MIDI kits, and some very simple modifications.
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