One Control BJF Buffer Split

The One Control BJF Buffer Split is a small utility box that puts two jobs in one enclosure: it combines the functions of One Control's 1 Loop Box and AB Box, and it carries the BJF Buffer, a buffer circuit designed by Björn Juhl of BJFe¹. In practice that means it can route your guitar between two destinations, switch a loop of pedals in and out of the chain, and condition the signal so long cable runs and rows of true bypass pedals do not dull your tone. One Control calls it "an extremely versatile utility box to have on your pedalboard"¹.

The unit is currently listed as sold out on One Control's own store, at a sale price of $109.99 USD against a regular price of $137.99 USD, as of October 2026¹.

A buffer and A/B box in one

The box works as an A/B switcher, selecting between two signal paths¹. The buffer side is what sets it apart from a plain A/B box. A buffer is a small amplification stage placed in the signal chain that drives the cable with a low output impedance, so the high-frequency loss and tone dulling caused by long cables and many true bypass pedals in series is reduced.

One Control describes what the BJF Buffer does in player's terms:

The same idea shows up across the range. The Minimal Series Pedal Board Junction Box with BJF Buffer is described by One Control as "a small box with two inputs and two outputs which is very simple, but makes a tremendous difference in your sound," with an ultra-low noise output and an input impedance of 500kΩ with the buffer on³. Its BUFFER/PASSIVE switch turns the buffer on and off, and in passive mode no power is needed at all³. It also adds a polarity reverse switch that inverts the phase between the buffer in and out jacks, working only when the buffer switch is on the buffer side³.

Power and current draw

The BJF Buffer Split draws only 3mA, which One Control lists as its consumption current¹. That matches the standalone Minimal Series BJF Buffer, also listed at 3mA². For comparison, other One Control pedals that include the buffer circuit draw more because of their other functions: the Mosquito Blender Trail and Mosquito Blender Expressio are each listed at 12mA⁴⁵, while the LX Tuner with BJF Buffer draws up to 40mA⁶.

The standalone Minimal Series BJF Buffer runs on a center-minus DC9V adapter, and One Control states plainly that batteries cannot be used with it². The Black Loop Deluxe with BJF Buffer is specified at 9V DC center negative⁸, and the White Loop with BJF Buffer works with a center-negative DC9V adapter⁹.

Size and price

The BJF Buffer Split measures 101mm deep and weighs 150g¹. Its list price is $109.99 USD, shown alongside a regular price of $137.99 USD, and it is currently sold out¹. The other Minimal Series units with the BJF Buffer, including the standalone BJF Buffer, the White Loop and the Black Loop, are also sold out⁵⁹¹⁰.

The standalone Minimal Series BJF Buffer was listed at $96.99 USD and is also shown as sold out².

The BJF Buffer and Björn Juhl

The circuit is named for its designer. Björn Juhl, the founder of BJFe, designed the buffer to address the problems of varied cable lengths and true bypass pedals in the signal chain². In an interview published on One Control's site, the buffer's history is traced to the start of the collaboration: "We started with the BJF Buffer," and the circuit was then "brought to One Control both as a standalone pedal and featured in the loop switchers"¹¹.

One Control's BJF series is known for putting these circuits in very small housings. As Juhl himself put it¹²:

A key specification of the buffer is its unity gain setting. One Control lists a "Precise Unity Gain setting to 1" for the circuit⁵, meaning the buffer passes the signal at the same level it receives it, neither boosting nor cutting, while still driving the line. That is what allows it to strengthen a signal without changing the apparent volume or distortion².

Which other One Control pedals include the BJF Buffer

The BJF Buffer is not confined to the Buffer Split. One Control states that the exact buffer circuit is installed in many of its switchers², and the range bears this out:

• Minimal Series BJF Buffer: the standalone buffer pedal²
• Pedal Board Junction Box with BJF Buffer: junction box with buffer on/off and passive mode³
• White Loop with BJF Buffer and Black Loop with BJF Buffer: loop switchers⁹¹⁰
• Black Loop Deluxe with BJF Buffer: built-in BJF Buffer switchable between true bypass and buffered bypass operation⁸
• Mosquito Blender Trail with BJF Buffer: blender with an optional on/off BJF Buffer circuit⁴
• Mosquito Blender Expressio with BJF Buffer: applies the BJF Buffer to the input part via its own switch⁵
• LX Tuner with BJF Buffer and Minimal Series Tuner MKII with BJF Buffer: tuners with the buffer built in⁶⁷

The BJF Buffer circuit is installed in many switchers from One Control, and One Control describes it as one of the most natural-sounding buffers available⁵³. Beyond the loop switchers, the circuit was brought to One Control both as a standalone pedal and featured in the loop switchers¹¹. It also reaches the company's tuners: the LX Tuner is a tuner pedal with buffer⁶⁷, and the Minimal Series Tuner MKII is a tuner with a built-in BJF Buffer⁷.

Videos

Click to load

Click to load

Questions