Introducing Houston: A bomb-proof, OSHW multi-master MIDI clock that you can build for about $50 using readily available parts. Make it the center of your live pa rig! The Problem Normally, MIDI devices are slaved to a single master unit, but what if something about that unit crashes or blocks playback for whatever reason? Short answer: 'kablammo!' Additionally, if a slave device fails to playback, there's not much recourse for resyncing it to the rest of the performance. This device provides a solid performance playback platform that: In live performance applications, this means that one wrong move on the sequencers means a major interruption of the music. Automatically stops, rewinds and resyncs up to 4 channels of MIDI slaves back into the mix on the downbeat with a selectable count-in.Drastically lowers the chances of a full audio lockup (DAW crashes, PC hardware communication issues, playback-blocking sequencer parameter changes, etc.). Large, intuitive displays to show all performance parameters including the count-in time, the current tempo and the current measure.4 independent, hardware UART synchronized midi channels (+/- 0.1 BPM jitter).It dramatically frees up your hands to focus on the mix and switch to new songs unit by unit without interruption. There are some basic features like PCB layout design, size, number of analog pins and breadboard friendly nature that make them different from each other.