MATRIXSYNTH: Sequential Circuits Pro One Synthesizer Turbo CPU MIDI + CV

Tuesday, May 06, 2014

Sequential Circuits Pro One Synthesizer Turbo CPU MIDI + CV

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"This amazing synth is in great shape for it's age and includes the Music Technologies Group Turbo CPU, MIDI and CV upgrade! Professionally installed.

Everything works perfectly. There is a slight mechanical noise on the lowest key when pressed but it doesn't effect the triggering. The filter caps were upgraded to polystyrene for stability and superior sound.

The MTG Turbo upgrade includes the following:

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. 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. Pads for optional DAC chip (see CV option below). Soldering and installation are required for MIDI. Turbo CPU + MIDI + CV (Beta) For the handy DIYers, add a tiny MCP4728 chip to the v2.00 MIDI board (soon to be available pre-installed as well) and 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!?"

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