![]() Maybe I’ll replace them with something more retro like green or red in the future. They are ‘modern’ bright blue LEDs – not a big fan. not sure how I like this, but it’s all configurable).įinally I pushed the MIDI LEDs into the holes drilled in the chassis. I also had control over filter resonance and cutoff (connected to mod wheel and using the extra LFO of the new CPU. Now I could control pitch bend over MIDI! The range defaults to 2 semitones, nicer than the Pro-One’s “about a fifth” and much more playable (Looking at you, non-spring loaded pitch bend wheel). Step 3 – soldering molex connector in the other endĪnother test. ![]() Step 2 – soldering 2 wires to control Osc 1&2 Step 1 – soldering 2 wires to control Filter Cutoff and Resonance The remaining 5 pin connector is for the wires with CV signals going from the MIDI board and back to the main PCB (for pitch bend, filter control etc over MIDI). Now I did a quick test of both MIDI In and Out – all working! A strange move, considering that the company. Q uite at the end of the great analog aera, Sequential Circuits presented their first and only monophonic in 1981. It was released at a time when monophonic synths had to fight a final battle against polyphonics, which became more and more popular. Step 5 – Mounting MIDI board and connecting it all Sequential’s Pro-One synthesizer is a miracle. Step 4 – Mounting MIDI connectors Drilling with increasingly bigger drills, then filing the last bit, phew… Modified or replaced graphics noted as such. Original format retained wherever possible. Scanned from a photocopy of the original. Step 3 – MIDI board wiring (MIDI connectors and LEDs) The Sequential Circuits Pro-One Annotated Manual Annotations in bold square brackets by jet. Step 2 – Molex connectors on wires from main PCB ![]() I added molex connectors to the board and the 6 wires so that the Pro-One lid (which has the PCB with the CPU) can be detached from the bottom (which has the MIDI board and connectors) Step 4 – mounting new CPU board and cable ties Step 3 – drilling holes in PCB for cable ties Step 1 – soldering the 6 wires to the CPU board 4 for MIDI, 2 for the extra CV stuff that will control pitch bend, cutoff etc over MIDI. The Turbo CPU attaches to the separate MIDI board with 6 wires. There are other benefits such as faster performance (although this may border on unnoticable) and also completely new features such as an extra LFO (which I probably won’t use). 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. The main reason for me to get it was that there was a MIDI option for it as well. A monophonic, analogue synth produced by Sequential Circuits in the early 1980s. The Turbo CPU board replaces the original Pro-One CPU and fits right in the old CPU socket. I bought the MTG Turbo CPU replacement, the extra MIDI board, and the CV option (to control filter and stuff via midi).Ĭheck out Music Technologies Group Turbo CPU here!
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