British synth wizard LOOKMUMNOCOMPUTER returns with part two of the Stepper Leslie saga, transforming a clunky old Leslie speaker into a mechanical marvel. Expect eccentric builds, DIY charm, and some serious sonic experimentation that’s both eye-catching and ear-pleasing.

9. May 2025
SPARKY
LOOKMUMNOCOMPUTER’s Sonic Odyssey: The Stepper Leslie Adventure Continues
Arduino, Cinch Jones connector, NEMA 17 Motor, Stepper Leslie
The Skeleton Gazebo
Let’s kick things off with LOOKMUMNOCOMPUTER’s unique twist on your grandma’s old Leslie speaker. The man doesn’t just resurrect the forgotten relic; he gives it an undead skeleton makeover. What appears to be a mad scientist’s approach is more like a crafty DIY session inside a rave bunker. By the end of this video, even those wooden panels are dancing along with the shrieking notes. With a wink and a nod, he’s put the whole thing in a skeleton enclosure – because visibility matters when you’re showing off to the museum crowd. It’s a visual spectacle, and he reckons it’s a win-win situation if it sounds just as funky as it looks. It’s like taking a trip back to the disco, but this time, the skeletons are real.

"Well today we're going to go about finishing this project by building the baffle into another skeleton enclosure."
© Screenshot/Quote: Lookmumnocomputer (YouTube)
From Rot to Rave

"So let's pull this bit of metal off that keeps the baffle straight."
© Screenshot/Quote: Lookmumnocomputer (YouTube)
LOOKMUMNOCOMPUTER dives into the deep end with a Leslie speaker that’s seen better days. The baffle was barely holding on, but he’s got that sorted faster than you can say ‘rotational dynamics’. Removing the original motor – which might as well have been powering a Victorian carousel – he replaces it with a steppin’ stepper motor that could dance through any toaster-fight. The switch to a tidy NEMA 17 motor – the type that’s quieter than a sugar glider in a whispering competition – enables a seamless, smooth rotation. What you end up with is nothing less than a sonic street weapon, geared up for both museum show and recording studio flair. This is synth DIY at its rawest: cobbling together a mechanical wonder from parts more suited to a scrapyard than a debutante ball.
Welding Dreams into Reality
Our fearless creator rolls up his sleeves – or rather, covers up his sore throat – and gets down with some good old-fashioned metalwork. Welding isn’t just a skill, it’s an art form, and LOOKMUMNOCOMPUTER proves that practice makes… well, perfectly acceptable if you’ve got a hammer at hand. Using nifty 90-degree clamps, he beats the iron into submission, crafting a solid base for his madman contraption. The beauty here is in the details; yeah, he’s learned the trick of the trade, turning a chaotic pile of parts into a rust-resistant rave-ready frame. Every creak of the welder, every clang of the hammer brings us closer to the dawning of a mechanical beast whose grooves you won’t soon forget.
Taming the Stepper Beast with Arduino Magic
Now, the Arduino enters the scene like a silent hero in a sci-fi film, ready to bring the Stepper Leslie to life. LOOKMUMNOCOMPUTER taps into the digital realm to ensure this project not only moves but grooves. With the Arduino controlling the baffle and the horn rotation, suddenly there’s potential for serious customisation. Hardware old meets code new in this glorious showdown – and dare I say, the code doesn’t even flinch. It’s all hands on deck with control voltage and a cheeky bit of MIDI action running the show. The connections are as intricate as a synth jam that syncs perfectly first try. The tech gloop that ties this beast together is nothing short of ridiculous, yet it fits seamlessly into the mad synth scientist’s plan – creating not just a sound, but an experience. Expect modulations, directional shifts, and the promise of sequenced revolutions; music shifting directions like a well-timed turntable spin.

"This is connected straight to the stepper motor driver direction pin."
© Screenshot/Quote: Lookmumnocomputer (YouTube)
A Symphony of Noise
With the skeleton dressed and tech in tow, LOOKMUMNOCOMPUTER’s Stepper Leslie is ready to play. The introduction of MIDI control and envelope-generated spinning creates an interaction between musician and machine that’s like conducting an orchestra of robots at a street rave. Each note, each synth-infused whirl delivers a new auditory experience, blurring the lines between chaos and composition. This beast isn’t just a pretty face for the museum; it’s interactive art that beckons with each turn of the baffle. The sounds range from subtle modulations to intense spirals of auditory delight, proof that motors and music can indeed be soulmates in the right hands.
Foot Control and the Final Spin

"So I repurposed an old volume pedal."
© Screenshot/Quote: Lookmumnocomputer (YouTube)
Not one to shy away from another layer of complexity, LOOKMUMNOCOMPUTER introduces a repurposed foot pedal to control his sonic marvel. A nifty hack sees an old volume pedal transformed into an expression pedal, allowing musicians to foot-tango with modulation data. It’s a move that isn’t just practical – it’s pure genius for live jams where hands are tied but feet are free. The pedal’s performance is as stylish as the resolver itself, guiding spins from leisurely to whiplash without so much as a button press. As the video draws to a close, LOOKMUMNOCOMPUTER’s Leslie stands as a testament to freakish ingenuity, a creation that dances as beautifully as it plays – whether in a crowded studio or a more serene electronic mausoleum.
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