Switch between true bypass or the newly-developed ULTRA BUFFER. The Pitchblack X not only features a true bypass for outputting the sound exactly as it was input, but now includes a built-in ULTRA BUFFER Why is this important? The majority of electric guitars use passive pickups with a high impedance output. When you are using a cable there is a loss of tone, usually high frequencies, after about 6 m (around 18 feet) and this problem gets worse the longer your cable. A buffer boosts the signal over long cables to avoid loss of tone, keeping it clean and clear - even when your pedal is off. The ULTRA BUFFER enhances the sound quality in bypass mode, so that you can still maintain audio quality even when using a long cable to connect to the tuner, or when inserting the tuner into a complex effects board. On the Pitchblack X, you can switch between true bypass and the ULTRA BUFFER, according to your tastes and performance environment. Meter LED also offers bright mode settings for high visibility. Besides the enlarged display, more meter LEDs have been added for superior visibility. The bright mode (brightness) can be set at one of two levels, so that you can be sure to see the tuner display even better in situations where visibility is difficult, such as brightly lit stages and bright outdoor environments. Ultra-high tuning accuracy down to ±0.1 cents. The Pitchblack X offers highly precise and accurate tuning within a precision of ±0.1 cents when in Strobe mode,making it ideal for situations where the tuning must be absolutely right whether performing or recording.