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[Get rid of the digital feel] 5 buffer/clean boosters to use with your multi-effects unit [for an amp-like sound]

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Helix, Quad Cortex, Kemper, HX Stomp...
Modern multi-effectors are highly functional and offer an astonishing degree of freedom in sound design.

But at the same time, have you ever felt this way?

  • "It's not bad, but it's a bit lacking."
  • "The sound is hard, flat, and sounds like 'sound from inside a box'"
  • "When I recorded it, it was fluent..."

The cause of this "feeling that something is missing" may be a lack of quality in the "front end" where the signal goes from the guitar to the multi-effects device.

In such cases, we recommend trying the use of a buffer/clean booster.
Just by adding one unit, your guitar sound will become surprisingly "amp-like" and "sounds great."

This time, it goes great with multi.

We've carefully selected 5 buffer/clean boosters that will truly "change the sound."

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Please use Sound House again next time.

Why is a "buffer/booster" effective for multi-channel audio?

Multi-effectors are versatile, but they are quite picky about the guitar input signal.
As the length of the shield and the number of effects increase,The high frequencies are cut off and the sound is lacking in core.It becomes.

In such a case, adjust the signalHigh quality bufferor adding thickness to the original soundClean BoosterBy inserting one unit, you can achieve the following changes:

  • Prevents sound loss (recovers high-frequency loss)
  • Enhancement of sound contour and presence
  • Improves the feel of spatial effects
  • Picking nuances are reflected more naturally

Especially if you want to get back the "feeling of playing through an amplifier"The pre-stage correction is very effective.

Great for multi-effects! 5 buffer/clean boosters that really "change the sound"

Xotic / Super Clean

Equipment explanation

Xotic's Super Clean is, as its name suggests, a "very transparent clean booster." While the EP Booster is designed to add midrange thickness and stickiness derived from the Echoplex preamp, the Super Clean is specialized for purer and more natural correction. Its feature is that it adds core and thickness while preserving the character of the original sound without adding any quirks to the signal.

There are four DIP switches inside, allowing you to tune the tone to your liking, such as Bright (high frequency), Mid, Bass, and Tight. For example, if the Strat single coil sounds a little thin, you can add Mid Boost, or if you want to add sparkle to a clean tone, turn on Bright. These only give the character a "little bit" of direction, and the basic premise is a clean and natural tone.

When combined with a multi-effects unit, Super Clean works extremely well, and connecting it to the input stage of a Helix, HX Stomp, Quad Cortex, etc. will clearly change the "sound projection," "resolution," and "rich harmonic feeling." Its greatest appeal is that it removes some of the digital smell and brings the sound closer to a natural sound as if it were being played through an amplifier. Of course, you can boost the sound by up to +12dB by turning up the gain knob, but the true value of Super Clean is in using it all the time on, where "the sound gets better without doing anything."

Users have given many positive reviews, with comments such as "The sound comes out more forward, whether clean or distorted," "The feel when you play is softer," and "The feel of spatial effects has clearly changed," making this a pedal that could be the "final piece" for players who struggle with the stiffness of multi-effect pedals.

Super Clean is recommended for these people!


  • Those who feel that the sound is "hard" or "the contours are hard" with multi-channel
  • Those who want a natural thickness that cannot be achieved with EQ
  • Those who want to add depth and luster to clean tones

User Voice

"It really brings the sound forward, whether clean or distorted."
"The sound of the Strat, which I had previously thought was thin, has become thicker and fuller."
"I use it with it on all the time. It's such a natural effect that it feels lacking when I turn it off."

Xotic
24,200 JPY(TAX+) (As of 2026:05 on March 19, 03 | According to Amazon)

Lee Custom Amplifier / 12AU7BB

Equipment explanation

The 12AU7BB by Lee Custom Amplifier is a buffer/booster that utilizes the precision craftsmanship that can only be achieved by hand in Japan, and the natural overtones of the 12AU7 vacuum tube. Equipped with one Electro-Harmonix 12AU7 vacuum tube inside, it maintains the natural texture of the signal while transforming it into a sound with air and depth. What is particularly distinctive is its natural correction power, which is said to improve the sound just by passing it through.

It doesn't change the tone dramatically, but it adds a smooth roundness to all frequencies, and whether clean or distorted, it gives the tone a sense of luxury. Many users who have used it in combination with HX Stomp or Quad Cortex have said that the "line smell has been reduced" and "picking has become more comfortable."

In particular, it adds the natural "thickness" and "breathiness" of tubes to the "flat and hard sound" that is common in modelers and multi-amps, so players of any genre can experience its benefits. It is excellent both as a natural clean booster and as a pre-buffer for spatial effects.

12AU7BB is recommended for these people!


  • Those who want a more "lifelike" sound for their modelers
  • Those who want to naturally correct picking nuances
  • Those who want the luster and depth that is unique to vacuum tubes

User Voice

"It really brings out the subtleties of your fingers."
"The hard, tiring sound has become more pleasant to play."
"The sound becomes deeper. It's a texture that you can't get with just EQ."

Lee Custom Amplifier
35,200 JPY(TAX+) (As of 2026:05, March 16, 05 | Rakuten Market research)

Lee Custom Amplifier / 12AU7Pre

Equipment explanation

It is a sibling model equipped with the same 12AU7 tube as the 12AU7BB, but as the name "Pre" suggests, this model is specialized for use in the front end. While it shares with the BB the thickness and warmth of the sound, the 12AU7Pre excels in adjusting the "nuances of picking" and "softness of attack."

Its greatest feature is that it feels very natural to play, whether clean or distorted. By passing the pedal through, the sound is transferred smoothly from your fingertips to the amp, resulting in a well-balanced sound that sounds like a perfect combination of compression and EQ. The appeal is that it adds high-quality high frequencies that are not painful to the ears and smooth, rounded mids to the sound of a multi-effect guitar, which tends to have harsh highs.

Users who have plugged it directly into Quad Cortex or Helix have commented that "the coldness of the line has been eliminated" and "I could tell the difference the moment I played." The circuit is extremely quiet and has little noise, so it can be used stress-free in recording and in-ear monitor environments.

If the 12AU7BB is a type that enriches the overall sound image, the 12AU7Pre is a "player-oriented" correction tool that focuses on the comfort of playing. It is a unit that will comfortably change the touch of your playing.

The 12AU7Pre is recommended for these people!


  • Those who feel that the sound of multi-channel is "hard and cold"
  • Those who want high-quality overtones and rounded nuances
  • Those who want to utilize the "stickiness" of vacuum tubes in a clean environment

User Voice

"It really brings out the subtleties of your fingers."
"The hard, tiring sound has become more pleasant to play."
"The sound becomes deeper. It's a texture that you can't get with just EQ."

Lee Custom Amplifier
39,600 JPY(TAX+) (As of 2026:05, March 16, 05 | Rakuten Market research)

THINGS / beyond Tube Buffer 2S

Equipment explanation

The beyond Tube Buffer 2S is a vacuum tube buffer/booster by Tokyo builder "THINGS." While it has a simple one-knob design, it drives an Electro-Harmonix 1AU12 tube with internal boosting, adding rich harmonics and a natural thickness to the sound.

The appeal of this pedal is the improvement in three-dimensionality that can be felt just by passing it through. When combined with a clean multi-effects unit in particular, the signal density increases, and the response of spatial effects improves. The attack at the beginning of playing becomes softer, and the sound becomes more familiar to the ear, but the core is firmly maintained, so the contours do not become unclear.

In addition, by taking advantage of its characteristic of being slightly distorted when the gain is increased, it can also be used as a "flavor booster" to add a little sexiness. It is actually used in professional recording studios, and shows its true value in situations where natural saturation is required.

We recommend beyond Tube Buffer 2S to the following people!


  • Those who feel that the sound output from multi-channel headphones is "flat"
  • Those who feel that the space is not expanding comfortably
  • Those who want to keep the natural thickness of vacuum tubes always on

User Voice

"The flatness that is characteristic of multi-layered surfaces has disappeared.The sound began to float softly in the space.'
"Anyway, it feels good.It's different from the moment you play it.I felt that way.”
"Rather than adding thickness to the sound,The signal itself has improved in quality.That’s my impression.”

THINGS
31,130 JPY(TAX+) (As of 2026:05, March 16, 05 | Rakuten Market research)

OATS AND MOLASSES / VB-2 FET DRIVER

Equipment explanation

The VB-2 FET DRIVER by OATS AND MOLASSES may look like a small art pedal at first glance, but its capabilities are surprisingly professional.A sound character that combines the harmonic rise of FET (Field Effect Transistor) and a fuzz-like texture.

When used in combination with a multi-effects unit, this pedal is more than just a signal conditioner.A pre-processing tool that adds a subtle sense of distortion and texture to sounds that have been digitally over-processed, deliberately adding "fluctuations" and "roughness."It is very effective as a

Especially with modelers like Helix and Quad Cortex, the presets are too well-balanced, and the sound you hear in response to your playing can feel a bit inorganic. By connecting the VB-2 to the front,The natural harmonics and subtle nuances of FET are added to that overly smooth signal, giving you back the "feel of playing."

To use it, set the Gain/Bias knob low and leave it on all the time, and it will act as a natural booster, adding a slight thickness and nuanced saturation to the input signal.Unique distortion effect = Gives plain digital contours a "hand-drawn" feelThis makes it a great match for synth sounds and loop processing.

Especially for guitarists of instrumental, post-rock, ambient, and alternative music, this is a rare unit that can provide a presence and texture that cannot be achieved by simply "thickening" the sound.

The VB-2 FET DRIVER is a boost pedal that stimulates the player's senses by achieving the finest balance between "correction" and "destruction."

The VB-2 FET DRIVER is recommended for these people!


  • Those who feel that the sound of multi-effects and amp simulators lacks "airiness"
  • Those who want to naturally add thickness and shine to the vacuum tube with a "correction level"
  • Those who want to achieve a "deep sound image" whether clean or distorted

User Voice

"The VB-2 is a versatile pedal that can be used with synths and drum machines to add a unique character to your sounds."
"By adjusting the Bias control, you can freely change from overdrive to fuzz, expanding the range of your playing."
"It has a handcrafted quality, is beautifully designed and is a pleasure to own."

[Summary] Multiplayer is where the "preliminary magic" comes in

Multi-effectors are versatile,
It doesn't just make the guitar sound better..

RatherIf the "material" input from the guitar is not in good condition, the original performance will not be utilized.

The five models introduced this time each take a different approach to adjusting the sound quality,
A powerful companion that transforms "digital" tones into amp-like tones.

  • Super Clean provides balanced sound pressure and three-dimensionality.
  • The 12AU7BB and 12AU7Pre add the luster and thickness that only vacuum tubes can provide.
  • The beyond Tube Buffer adds depth with pure signal enhancement.
  • The Sunday Driver improves the sound quality and resonance while maintaining transparency.

"EQ doesn't work," "It sounds better with an amp..." That discomfort you may have felt before is now gone.
Adding just one buffer or booster may solve the problem..

For those who want to get the multi-sound closer to the real thing.
First, try out these five machines and experience the "first-stage revolution."

\ Going to meet Sound House's sister /

An older sister I often see

Please use Sound House again next time.


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