* MTG Pro One Turbo CPU *
The ultimate upgrade for the one of the world's most loved mononsynths!
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Turbo CPU
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).
Features:
- Plug-n-Play! No soldering required!
- Supports the original functionality including the sequencer and arpeggiator.
- Each sequence can be up to 256 steps (compared to total of 40 steps on the original).
- Sequences are retained in memory even after power-down. The CPU module does not use a battery.
- Power-on settable parameters for clock start mode, arpeggio up/down end notes, arpeggio down mode and arpeggio gate time.
- Sequence Tie mode allows for a variety of note lengths.
- Sequence End mode lets you chain the two sequences.
- Optional: If you want to make your own MIDI interface, instructions are in the manual. If you want MIDI hardware included, see CPU+MIDI.
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Turbo CPU + MIDI 
The above plus a MIDI In/Out interface board that adds the following features*:
- Firmware update (“re-flashing”) over MIDI (using MIDIOX or similar).
- Settable MIDI channel.
- Receive MIDI note data.
- Monophonic MIDI output of arpeggiator and sequencer data.
- Polyphonic MIDI output of keyboard data.
- Arpeggiator and sequencer sync-able to MIDI Sync In (settable clock rate).
- Load/Save sequence data over MIDI.
- MIDI In, MIDI Out and optional MIDI Thru.
- Optional MIDI In/Out activity LEDs.
- Soldering and installation are required for MIDI.
* - If you make your own DIY MIDI interface it can do all this too!
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Turbo CPU + MIDI + CV 
For the handy DIYers, invest in the inexpensive add-on shown left (MCP4728EV ... $15USD) and massive analog control over MIDI will be yours!
Simply connect it via 4 wires the the MTG Turbo CPU and then tie into the Pro one using 4 more wires. No trace cutting or case butchering!
It's available from fine electronics distributors worldwide (or get it here).
- Complete instructions coming soon.
- All you need is the above board, some wire and 6 resistors.
- Four 12-bit digital-to-analog converters.
- Supports MIDI Pitch Bend receive including setting the range/sensitivity using RPN.
- Control of Filter Cutoff and/or Resonance.
- LFO2 with multiple waveforms (Square, Saw, Triangle, Sine, including Sample & Hold).
- LFO2 range from 0.1Hz to 10Hz (10 seconds/cycle to .1 seconds/cycle).
- ... and more!
I am looking for a couple of BETA testers for this. If you already have the CPU+MIDI then I will send you at cost the CV board and
the resistors ($20USD includes shipping in the USA). Email me.
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Manual 
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User manual (150kB PDF) Contains preliminary/beta CV info.
Installation manual (1MB PDF) Contains preliminary/beta CV install.
Please also see the Release Notes in the Firmware section below.
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Ordering Information
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Please note: I am building these by hand for now. Quantities at any given time are limited.
I'm using my eBay page for the time being but if you want a 10% savings, email and we can do it via PayPal directly.
Please order off my eBay page.
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Firmware 
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Please read the Release Notes.
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System
Exclusive
Examples
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Some sample .SYX Sys Ex files for reading and writing the settable parameters (zipped).
These files are for MIDIOX (or a similar app) but the
included text file lists all the commands and you can cut and paste them into your favourite application/tool.
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"It came today and it's now in my Pro-One. Everything works perfectly! Thanks again!" - Ed (Canada)
"This is GREAT! Thanks. - J.L. (Canada)
"Exactly as expected, fast shipping. Thanks." - G.M. (USA) via eBay
"Thank you, item as described, my Pro One is singing again." - A.N. (Australia) via eBay
"GRANT you are a genius, this is so much fun. Support this guy, its essential for a pro-one and expands its so much beyond."
- D.B.S. (USA)
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.:Music Technologies Group:.
