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XYXO

Parallel, series, blending, filtering.  A mixing pallette for your board. 

X/Y XO (X+Y+crossover).

We pronounce it 'zi-zo'.

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XYXO takes your instrument signal, buffers it (internal input gain trimmer) then splits it two ways. X and Y. A send and return to two pedals.

 

Before the signal is sent, there's a high pass and low pass filter (both are 12dB per octave Sallen-Key). There is a phase switch to flip phase 180 degrees and a send level control. Both X and Y pedals that are plugged in, can be run in series (X into Y), or X and Y in parallel. The signals returned from pedals X and Y each have a return level control and are then summed together, together with a dry blend control. There's an overall high frequency EQ tone control, and then a master volume out. 

 

The phase switches in particular are incredibly powerful. These alone give you a 2 x 3 matrix of phase combinations. Both X and Y pedals can be phase flipped, and when combined with the straight dry signal, this gives you many possibilities.

 

XYXO has a Tails on/off function, which is found inside. This gives you two bypass modes; a relay true bypass plus a buffered bypass which combines the outputs of the X and Y pedals with the incoming instrument, allowing delay tails from the connected pedals to mix with the bypassed sound seamlessly.

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The many things that you can do with the XYXO.

​You can combine 2 overdrives in parallel. You can tweak the frequencies going to and from them. So it makes stacking overdrives lots of fun. You can turn a vibrato or any modulation effect into a chorus pedal using the dry blend control. You can combine effects in ways that you'd never have thought to do before; like running 2 delays in parallel, with slightly different delay times. Parallel compression; send 2 different frequency bands to 2 different compression pedals. You can keep the low end dry and affect the top end with a bass guitar. You could use it as a splitter to 2 amps... You might want to use a bass amp for the low end of your signal and a guitar amp for the top end. You could dial all the low frequencies down to the bass amp and all the top to the guitar amp.


Details

XYXO takes 9 to 18 volts DC, from a centre negative 2.1mm standard pedal DC jack. I recommend at least 200mA supply, and a fully isolated, quality power supply to avoid ground loops, buzzes and other problems.

The XYXO has a robust Horrothia-designed footswitch with a TPU rubber button and a glass fibre filled, surrounding ring, covering a conventional momentary foot switch.

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All Horrothia pedals are hand-built with love in Falmouth. United Kingdom. 

© 2026 Horrothia.  All Rights Reserved.

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