YOUTUBER: Stefan Gubatz | Dirtbox Jams | Acid Gubi

3. July 2026

ZAPP

Donner B1 Reality Check: Acid with Punch by Stefan Gubatz

© Picture: Stefan Gubatz | Dirtbox Jams | Acid Gubi (YouTube)

Donner B1 Reality Check: Acid with Punch by Stefan Gubatz

If you think you’ve seen every 303 clone, Stefan Gubatz brings out the Donner B1 and shakes up the Gameboy-case scene. In the video, trashy looks meet honest acid sound—with a dose of Gubatz humor that turns even the longest groovebox session into pure fun. Does the B1 have what it takes to fry up some serious beats, or does it get lost in the plastic sea? Read on to find out how much punch is really inside.

4. February 2026

ZAPP

Donner L1 Essential: Stefan Gubatz Throws the SH-101 Clone into the Beat-Frying Pan

© Picture: Stefan Gubatz | Dirtbox Jams | Acid Gubi (YouTube)

Donner L1 Essential: Stefan Gubatz Throws the SH-101 Clone into the Beat-Frying Pan

Stefan Gubatz has a new blinking toy on his desk – this time, the Donner L1 Essential, an expanded SH-101 clone with extras that even old Casio fans will find intriguing. In his typically honest and no-nonsense style, he takes the thing apart, tests, tweaks, and lets it sizzle. Magnetic keyboard, modular design, and a step sequencer that screams happy accidents – this isn’t just a review, it’s a performance. But where there’s light, there’s noise: Stefan doesn’t hold back on criticism but stays fair, showing why the L1 Essential deserves a spot on stage despite its quirks. If you

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