MetronicsLabshop

18/10/2026

Not your average jack lead! 🔧
I first started making these Metronics summing cables around ten years ago, after requests from Korg Volca users. They combine the left and right audio channels into a mono signal.
As word spread, musicians using other equipment with similar requirements started asking for their own versions. Later, members of a Positive Grid Spark amp Facebook group asked me to offer cables for their setups too.
Since then, I’ve developed right-angle connector options and other custom variations to suit different equipment, spaces and requirements.
Many users of other kit that needs this type of summing cable continue to contact me for custom orders.
Got an unusual requirement? Get in touch!

[email protected]

18/10/2026

A slightly unusual build at Metronics today - a custom 3.5mm stereo jack to RCA phono summing lead. 🔧
Two resistors tucked inside the RCA plug combine the left and right channels into mono.
A few close-ups of the work, plus the finished cable!

[email protected]

12/10/2026

Metronics Labshop update: all our custom summing cables and adaptors are now sent tracked. Every cable is hand-built to order, so please allow a few working days. If anything hasn't arrived, message us first, we always sort it out. metronics.co.uk

20/04/2026

At Metronics Labshop, we specialise in handmade, bespoke audio solutions designed by musicians, for musicians. Whether you're a synth enthusiast, a studio producer, or a gigging guitarist, your tone shouldn't be limited by "off-the-shelf" gear.

🥁 The Legendary Volca Beats Snare Mod:
Tired of that "thin" stock snare? Our industry-standard mod fixes the missing C78 component to give your Korg Volca Beats a fat, punchy, 808-style snare that actually cuts through the mix.

🎹 Smart Connectivity for Modern Rigs:
Our custom summing cables are built to solve the mono-input headache. Perfect for the Positive Grid Spark Amp, Korg Volca series, Roland Boutique, and Behringer gear. Get your full stereo signal summed into a single mono input without phasing or signal loss.

🔌 Vintage Gear Connectivity:
We also specialise in V-Trig to S-Trig converter cables. If you’re trying to sync modern sequencers or drum machines with vintage Moog or Korg gear, these are essential. We’ve designed them to bridge the voltage gap, ensuring your classic synths stay perfectly in time with your modern studio setup - no bulky converter boxes required!

🛠️ Quality You Can Trust:
Every cable is precision-crafted for studio reliability. Don’t settle for mass-produced leads - get the bespoke edge your music deserves.

Browse the shop today:
https://labshop.bigcartel.com/
https://reverb.com/uk/shop/metronics-labshop
www.metronics.co.uk/shop
[email protected]

09/04/2026

09/04/2026

Custom cables looking 🔥 from Metronics Labshop on Instagram featuring our NEUTRIK connectors!

Keep tagging us in your photos and we’ll keep reposting!

09/04/2026

We just wanted to make a quick note on here to make everyone aware we do supply Custom Cables for Moog analog synthesizers and can make cables using 1/4" Jacks or Cinch-Jones as required.
We also do many other VTrig to Strig Converter cables and Blackboxes.
Email:
[email protected]
Or give us a ring.