This is a newly developed (modern) replacement CPU for the Sequential Circuits Pro-One 8021. Bring that old Pro-One back to life or simply have a spare for the "unobtanium" 8021. 

Also works in the Weston PRO2021.

Turbo CPU Features:

  • Plug n Play. 
  • 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 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 my eBay item TurboCPU+MIDI. This option requires soldering.

Full instructions are available:  

Install Guide:
ProOneTurboCPU_Install_v141.pdf

User Guide:
ProOneTurboCPU_User_v141.pdf 


Canada and other International buyers: Consider using eBay's International Shipping option. Over time it has gotten a lot better, while USPS has gotten more expensive and complicated. 


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Please see my other auctions for more great gear and parts.

**DX7 backlit LCD's, DX7 4x expansions and SuperMAX+ upgrade boards
**TX7 backlit LCD's
**Kawai R100 and R50 ROM Switcher boards
**Midi Patch Changer Keypads


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