via this auction
See this post for a demo of the H-Pi TBX1.
"From https://hpi.zentral.zone/tbx1:
Got a standard MIDI keyboard? Retune it! TBX1 makes retuning as easy as pushing a button. Attach this little box to your synth and you can make any key play any pitch you want. It comes preloaded with 128 tunings for you to try out, and stores tuning tables in 4 layers, totaling over 500 tunings, which you can easily edit with Custom Scale Editor (cross-platform software, license included). Set up your own tuning, upload it to TBX1, and plug into any General MIDI controller and synthesizer to make your music. Portable and ready for the stage, TBX1 can also run for eight hours on batteries.Tuning
128 tables x 4 layers = 512 full range programmable tunings
General MIDI compatibility — Compatibility Requirements
Controls
jog dial: select and enter preset program parameters
MIDI LEDs: monitor MIDI IN and MIDI OUT traffic
LCD display: currently selected tuning, bank, patch and polyphony (with backlight ON/OFF switch)
sixteen channel switches: selectable MIDI output channel polyphony, from 1 to 16 voices
fifteen preset buttons: store and recall tuning, synthesizer bank and patch
14-bit MIDI pitch bend resolution: 0.01 cents
bypass switch: turn tuning function on and off without swapping cables
External MIDI Message Pedal / Sequencer Control
receive tuning table Changes
receive bank and patch changes
full sustain pedal support
full control of held key behavior when tuning table change messages are received
Inputs and Outputs
12V DC power input
MIDI IN: connect to any MIDI controller (keyboard, sequencer, etc.)
connect computer to MIDI IN to upload tunings
MIDI OUT: connect to any general MIDI tone module, sampler or computer MIDI interface for tuned output
sends the following MIDI data on selected channels
bank select, patch change, pitch bend range RPNs, 14-bit pitch bend
note on / note off (one note per channel = monotimbral up to 16 voice polyphony)
MIDI Velocity, Modulation, and Volume are passed as received at MIDI IN
MIDI THRU: sends unmodified MIDI data received at the MIDI in through to another unit."
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