Korg PBX Pitchblack X Chromatic Pedal TunerThe Korg PBX chromatic pedal tuner features a true bypass for outputting the sound exactly as it was input, but now includes a built in ULTRA BUFFER that boosts the signal over long cables to avoid loss of tone, keeping it clean and clear even when your pedal is off. The next generation, pedal tuner featuring the new ULTRA BUFFER is even more powerful and easy to use! Features Allows switching between true bypass and the newly developed ULTRA BUFFER