Stereo signal routing for your pedalboard
SHIPPING TO THE USA – The Royal Mail has created a new PDDP (Postal Delivery Duties Paid) service, which will calculate exact costs at the moment we book your shipping. While we are happy to absorb some of the costs, if the cost of the pre-paid duty is significantly more than what you have paid when placing your order, we will be in touch to request the balance is covered by you.
If in doubt, get in touch and we can give you an accurate quote in advance.
We offer free 48-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 KMA Machines Stereo AB/Y is a passive stereo AB/Y box with active switching, enabling you to route your signal in various ways. Send a stereo source to two separate destinations, such as two different effects chains, or switch between two stereo sources (such as different guitars) feeding the same setup.
Separate left and right connections on all three paths make it a practical routing tool for stereo pedalboards, keyboards and recording setups.
Connect the output of your stereo pedalboard to Y, with A and B feeding different stereo destinations. Select either destination on its own, or engage both together. It's a straightforward way to choose where your stereo signal goes without repatching between songs or takes.
The audio path also works in reverse. Connect two stereo devices to A and B, then take Y into a shared stereo effects chain or recording input. Switch between a keyboard and a drum machine, for example, or bring two stereo effects chains together in parallel for a huge wall of texture.
The A | B footswitch selects between the individual A and B paths, while thhe A & B footswitch connects both simultaneously; press it again to return to the individual path you previously selected. Red indicates A, yellow indicates B, and blue shows that both are active.
Each top-mounted routing connection has its own left and right jack sockets for stereo signal paths.
The Stereo AB/Y keeps the audio path passive. A separate powered relay circuit handles the soft switching, designed to reduce mechanical noise and unwanted switching clicks and pops.



