Butterfly (Harmonic Tremolo)



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Harmonic Tremolo + Tonal Amusement Park

This Butterfly has endless patterns for all you tone freaks and tweakaholics..

While most tremolos modulate the signal by rhythmically lowering and raising the volume, the Red Noise Butterfly utilizes a Low Pass Filter to achieve a warm and articulated tremolo sound, providing pliable tonality and flexibility.

Here are a few of its special features:

  • Manual Mode turns off the LFO and allows manual control of the low pass filter’s cutoff frequency.
  • Dry/Wet Signal Mixer allowing for parallel processing
  • Two EQ controls: Bass / Treble tilt + Mid Boost/Cut (only on the ‘Wet’ signal)
  • Tap tempo Foot switch 





Controls the overall output volume from the pedal.

Dry / Wet

The Butterfly splits in input signal in such a way that a “dry” signal can be mixed with the “wet” processed one. 

All functions, knobs and switches on the pedal apply only to the “wet” signal except for the Vol Knob which controls the mixed output. 

The “dry” signal is buffered. 

B / T 

The Bass and Treble knob accentuates lows while reducing highs and vice versa around a center frequency of 800Hz. When the knob is centered the response is flat.


Mid Boost/Cut at center freq of  800Hz. 

When the knob is centered the response is flat. 

This control was designed to compensate and emphasize when lacking mids so it can amplify a lot… If you get distortion just take it down a notch.


Determines the range in which the filter is functioning. Clockwise = higher in the frequency range. Counter clockwise = lower in the frequency range. 

Soft / Hard 

Sets two mods of operation with different Q and depth:

Soft - More subtle and shallow

Hard - More pronounced and choppy

LFO / Man.

Determines the modulation source: 

LFO – The Butterfly modulates automatically and moves according with the chosen wave shape and speed. In 

Manual – The Butterfly can be used as a low pass filter. Control the cutoff frequency using the Speed / Freq. knob. 

*Please note that the range of the filter still depends on the position of the ‘Range’ and ‘Soft / Hard’ functions so be sure to set those controls to fit your filtering desires. 

Sync Input 

This is an external sync input connected to the Tap Tempo button. This allows the LFO to be synchronized to an external clock signal. The circuit provides protection against negative voltages and signals up to 18V or so

ON Footswitch 

Turns the effect on and off. When in the ‘Off’ position the Butterfly is true bypass

Tap Footswitch 

Tap while the pedal is on or off to set the desired speed.

Power 9V negative center

The Butterfly loves you, love it too, feed it clean 9V negative center and it will gladly and delightfully flap its shiny wings for all to see.  



Getting started: 

Turn the Blend knob all the way clockwise (maximum tremolo)

Switch the Soft / Hard toggle on “Hard“

Switch the LFO / Man. Toggle to “LFO”

Range, mid and T/B knobs at the center.

Set a comfy Volume.

Using the Speed / Freq. knob or Tap Footswitch, set a desired speed.


Play with the Range knob and get a feel of the filter range.

Play with the wave shapes to get acquainted with the different accents they provide


Return Policy:

All Red Noise Pedals come with a 14 day money back guarantee as long as pedals are returned in their original new condition and are in perfect working order.

At Fuzz Audio, all vintage/NOS vacuum tubes purchased through our website are guaranteed for one year from purchase date. We accept returns for tubes going noisy, losing output/performance prematurely, and of course losing function all together.  (Read about power tubes below). 

We will not cover damage from red plating neglect, glass breakage of any kind, loose bases, or other obvious faults that are due to neglect, rough handling or egregious constant use. 

This policy is meant to protect the buyer from having a tube go out on them prematurely from a flaw we missed. Tubes, especially preamp tubes, should last half a lifetime, and well beyond a year, so we want to guarantee each customer that you get a tube that will last.

For power tubes, although we will honor any faults mentioned above, we will not accept a return for a power tube that has obviously been used for 6+ hours a day for every day of the year for one year. Power tubes that have clearly been used beyond their normal wear point will not be accepted. 

If you suspect one of your vintage Fuzz Audio tubes has gone bad within one year of purchasing, simply reach out via our chat or at Support@fuzzaudio.com and we will assist you in the warranty exchange process. No receipt is needed.

Please note, it is possible we will be out of stock of the tube that is in need of a swap. If this is the case, we will either offer a refund, credit, different tube, or send the first available tube of that type when it comes back in stock. 

If you have any questions or concerns, please reach out!

At Fuzz Audio:

  • We match all tubes for free!
  • All vintage tubes are guaranteed for one year.
  • All tubes are tested on a calibrated Hickok 539C, Amplitrex, Maxi-Matcher, or other industry standard tube analyzers.
  • Preamp tubes are matched by gain and mutual conductance (Gm)
  • Power tubes matched by mA and Gm
  • All tubes tested for microphonics and are guaranteed to work in your application.
  • If you require SUPER LOW noise tubes, please reach out. We will most likely meet your requirements for free.
  • Do not hesitate to reach out if you have any questions or concerns, we are here for you.

We guarantee NOS test scores, clean pins, tight matches, and ultimately that they work in your application or YOUR MONEY BACK!

Tubes in photos represent the tube you will receive. Getter construction or logo may differ. Logo may be partially missing or cleaned off. You may or may not receive a box. Tube type, manufacture, and NOS test quality will NOT change. If logos and original boxes are a deal breaker- please reach out before purchase we are always happy to accommodate.

Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. 

To be eligible for a return, your item must be in the same condition that you received it. It must also be in the original packaging. 

 Non-returnable items:  
- Downloadable software products 

To complete your return, we require a receipt or proof of purchase. 
Please do not send your purchase back to the manufacturer. 

There are certain situations where only partial refunds are granted (if applicable) 
- Book with obvious signs of use 
- CD, DVD, VHS tape, software, video game, cassette tape, or vinyl record that has been opened 
- Any item not in its original condition, is damaged or missing parts for reasons not due to our error  

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund. 
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days. 

Late or missing refunds 
If you haven’t received a refund yet, first check your bank account again. 
Then contact your credit card company, it may take some time before your refund is officially posted. 
Next contact your bank. There is often some processing time before a refund is posted. 
If you’ve done all of this and you still have not received your refund yet, please contact us at Support@fuzzaudio.com.

We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at Support@fuzzaudio.com and send your item to: 7901 E Belleview Ave, Apt. 318, Englewood CO 80111, United States. 

To return your product, you should mail your product to: 7901 E Belleview Ave, Apt. 318, Englewood CO 80111, United States 

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund. 

Depending on where you live, the time it may take for your exchanged product to reach you, may vary. 

If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

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