Buying Guides
Superb Muff Variant With Harmonic & Clipping Toggles
Boost Guitar Pedals uses Royal Mail for all domestic deliveries and UPS for international deliveries.
UPDATE – As of 13th December 2024, we are
regrettably no longer able to ship to customers located within the EU or Northern Ireland, due to new GPSR regulations which make it prohibitively expensive for small businesses to operate in the zone.
UPDATE 2 – As of 10th April 2025, we are still shipping to the USA. Please note that due to the volatile political situation relating to tariffs, we may have to cease offering shipping here at short notice.
We offer free 24-hour tracked UK delivery on all orders over £150! Order before 9pm for next-working-day dispatch.
We offer 30-day hassle-free returns so you can pick the item you want safe in the knowledge that if it's not for you, we'll take it back and refund your order.
International deliveries are subject to additional import duties and VAT at your local rate. These charges are payable to the courier at time of delivery. Calculate how much you will need to pay here.
Please note that some orders may take longer to be processed before shipping during the busiest periods of the year.
Customers hold the right to return a product for a full refund if I am notified within 30 days of delivery.
If a product is delivered in a defective or damaged condition, please contact me immediately with details of your order.
To be eligible for a return, the item must be in the same condition
that you received it. It must also be in the original packaging.
Please note, the cost of return delivery is to be paid by the customer. This will be reimbursed if the item is shown to be faulty.
To complete a return, I require a receipt or proof of purchase. Please do not send any items back to the manufacturer, and please do not send any items to me without contacting me first.
Once I have confirmed that I will process your return, please send the item to:
Boost Guitar Pedals (returns)
84 Wolf Lane
Windsor
Berkshire
SL4 4YZ
United Kingdom
My first course of action for faulty items is to replace them like-for-like. If this is not possible, a full refund will be considered as an alternative.
If returned within the 30-day period, your refund will be processed and a credit will be applied to your credit card or original method of payment.
The customer is responsible for paying return shipping costs. Shipping costs are non-refundable unless a product is proven to be damaged or faulty upon delivery.
It is recommended that items should be returned using a trackable shipping service in case the item goes missing en route.
The Whimsy Machines Jeff V2 is a Muff-style fuzz - but not as you know it! For a start, the JFET gives this some beautiful amp-like overdriven sounds, but it can get incredibly Muffy too.
In case you were wondering, Jeff stands for "JFET Big Muff". The V2 builds on the first version with some truly unique features. There's a switchable pre-amp oscillation control, a clipping boost, and a Sweep control to focus your EQ.
Volume controls the output level.
Fuzz controls the clipping intensity.
The pre-amp stage has been replaced by a higher gain circuit in Jeff V2, with a switch to enable oscillation - or disable stability, depending on how you view things! When you activate the Oscillate Enable switch, you'll access some really organic (and pretty crazy) sounds.
The Clipping Boost toggle activates a high frequency boost of the JFET and silicon clipping stages, which pushes the gain and crunches things up beautifully.
The Low and High controls allow you to cut or boost the relevant bands of the 2-stage gyrator-based EQ.
The Sweep control allows you to dial in a frequency-specific boost, allowing you to turn the Muff into a mids-forward fuzz if that's your thing.
