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.

Turbo CPU + MIDI v2

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.

Turbo CPU + MIDI + CV  

For the handy DIYers, add a tiny MCP4728 chip to the v2.00 MIDI board (soon to be available pre-installed as well) and massive analog control over MIDI will be yours! Simply connect it via 2 additional wires from the MTG Turbo CPU and then tie into the Pro one using 4 CV wires. No trace cutting or case butchering!

See the firmware and manual(s) below.

• All you need is the MCP4728 chip, some wire and solder.
• 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!?

Manual

Also see the Release Notes in the Firmware section below.

USER manual                           (150kB PDF)     Contains preliminary/beta CV operation info.

INSTALLATION manual              (1MB PDF)       Does NOT contain CV install info. See below.

D-I-Y CV Installation manual   (750kB PDF)     Separate CV install info.

Ordering Information

Please note: I am building these by hand for now. Quantities at any given time are limited.

Please order off my eBay page.

Firmware

Please read the Release Notes.

• Version 1.10 : Download SYX file (Current CV Beta)
• Version 1.00 : Download SYX file (Current non-CV)

System
Exclusive
Examples

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.

• ProOneSysExExamples.zip : Download ZIP file

MIDI Patch Changer

Also under development, as time permits, is re-purposing the Genovation MiniTerminal 900 into programmable MIDI Patch Changer keypad. The unit sends MIDI Bank Selects as well as Patch Change and has quite a few other bells and whistles too. If you have a wish list item for it, contact me.

I have a set of MTG Pro One CPU Sys Ex files for the Genovation MIDI Patch Changer. This lets you change settings on the Pro One with one key. If anyone is interested, email me.

"I finished defining all the presets for mine and have tested it and it works like a charm!!! THANK YOU!!! All my patch changes take place in less than 1 second. I have a feeling this thing is going to be a very popular device among keyboard players..."
- Ed K (USA)

"I cannot thank you enough for the package that arrived on my doorstep last Thursday. Fantastic! I managed to program it up with the easy to use software editor and used it over the weekend and it worked perfectly. I will recommend this product to every keyboard player I know as it has so simplified my life on stage."
- Stephen S (England)