Available as an assembled Pedal and as a DIY project.
This Pedal is currently available.
Pedalboard Buffer Interface with 4 Internal Buffers, Isolation Transformer, Polarity Switch, FX Send, and 1M Ohm and 100 Ohm Input/Output Impedance
Well, I don't know who wrote it, but everyone has almost the same exact thing on the webpage where they're selling it, so I guess I'll copy & paste it as well.
"Every guitarist knows what it's like to try and track down that elusive perfect guitar and amp tone combination. When you do find it, that's why preserving your sound in your effects chain should be a priority, which is where Vertex Effects comes into play. Their Pedalboard Buffer Interface is your ideal solution for drastically reducing capacitance across your board, preventing high-end loss and keeping your carefully crafted tone in the spotlight, no matter your pedal configuration. This versatile unit incorporates proper buffering with the most common pedalboard setups including: mono, stereo, 4-cable method (amp with FX loop), 5-cable method (stereo amps with FX loops), wet/dry, and wet/dry/wet signals. Handcrafted by Vertex's devoted technicians in Lancaster, Calif., the Pedalboard Buffer Interface includes four total buffers. Rest assured: with this interface in tow, it will be easier than ever to outfit your pedalboard with a high-quality buffer that will keep your tone at the forefront.Vertex Effects is a company that prioritizes perfection and focuses on the detail in their work. They are committed to providing their customers with solutions to create innovative music and sounds and pedals that outperform all other equipment they have used. They work with many manufacturers to design custom hardware and components to ensure exceptional quality and sound."