Dubshift - unofficial firmware for Hotone Ampero II Stomp and Ampero Mini
🌐 https://dubshift.dev

What it is
Patches you build in the browser from your own stock file. Nothing to install, no Hotone files hosted.

• Dubshift 1.0 (Stomp 2.5.0, Mini 2.2): Loop Sync with the drums, 2 LFOs per preset, drum machine, XY pad, scenes, new effects • Groovebox 2.0 (Mini): our own firmware — 303-style synth, 808/727 drums, step sequencer, 4-clip looper, guitar track
• English unlock for Stomp 2.4.0 / 2.5.0, on stock or with Dubshift

⚠️ Read first
Not affiliated with or endorsed by Hotone. Modified firmware may void your warranty and can leave the pedal unusable until it is flashed again. Back up your presets.
Use at your own risk.

Bug report — post in comments under the release:
pedal / stock version / Dubshift version / what you did / what happened (+ video if you can)

Changelog: https://dubshift.dev/changelog.html

Dubshift 1.0 - Ampero II Stomp (2.5.0) and Ampero Mini (2.2)

The stock firmware with things Hotone didn't add.

Stomp
• Loop Sync: the looper follows the drums, loops close on the bar
• two LFOs per patch with their own screen, steps drawn with a finger
• user drum patterns with a step editor
• XY pad
• Quick Access knobs, footswitch actions, tap tempo averaging
• display brightness, scene paste fix

Mini
• Loop Sync
• two LFOs per patch with a step sequencer
• four scenes per patch
• seven new effects
• drum patterns with fills and a speed trainer
• XY pad

Build it from your own stock file: https://dubshift.dev
Bugs and questions — in the comments.

Groovebox 2.0.1 - our own firmware for the Ampero Mini

Not a mod: new screen, new sound engine, written from scratch.

• 303-style synth
• 12 synthesized 808 / 727 drums, step sequencer
• four-clip looper on the same clock
• guitar as a track: drive, comp, EQ, chorus, tremolo, tuner, delay and reverb sends
• eight projects in the pedal, multitouch

No stock amps and effects in this one — for those, stay on Dubshift 1.0.
2.0.1 fixes: multitouch off always works; projects from a newer version open read-only.

https://dubshift.dev/2.0.html

Bought an Ampero II Stomp with Chinese-only menus?

Dubshift unlocks English on firmware 2.4.0 and 2.5.0 — on the stock firmware, nothing else changes. Free.

https://dubshift.dev/english-unlock.html

Some news from the bench.

1.0.1 for the Mini and the Stomp is nearly done. It's a small update on the stock sound: the looper stops drifting away from the drums, plus a few small fixes (Sustainer, Opto 2A, scenes, XY pad). The Stomp finally gets the drum fills on a footswitch that I promised, and FREEZE on hold. I've already checked the Mini build on the pedal, the Stomp is next.

Mini 2.1 is on its third release candidate, and there's a lot in it:
- the pedal works as a USB audio interface: six channels into the computer (mix, synth and drums separately) and stereo back;
- a routing page: what goes where, left, right, which USB pair;
- a 6-slot guitar chain, effects in any order, rearranged while you play. You can feed the chain from the synth, the looper or audio from the computer;
- four actions on every footswitch (tap, hold, double, release) and a LIVE page;
- the EQ and compressor now actually match their knobs.

One bug is holding it: with USB plugged in, the rc hangs. I'm hunting it down. It won't go out until I've caught it.

And about the Stomp. Owners keep asking where their 2.0 is. All I'll say is that my Stomp is running something right now that has almost nothing to do with the stock firmware, and its hardware leaves a lot more room than the Mini's. I'll show it when there's something to show on video.

WOW

Hey! Just wanted to say that we are currently on a hard work to push new versions forward. It would be a much faster, but we had a big cheese to get: completely ours firmware on the Stomp. The thing is that Mini haves much simplistic design rather than Stomp (with its SHARC DSP). It was not easy to reverse it, but possible anyway.

There were much of interesting and hardly observable glitches during establishing connection between MCU and DSP. But it looks stable now.

Much of goals to achieve that we looking forward on. And we are about to start testing something that will change the game (we think so 😶‍🌫️).
So stay in touch. Later we will publish on Boosty or some other donation platform some articles about how we reversed it (btw I get very angry on Boosty because of their burocracy, which is not being even explained to me).

DUBSHIFT 1.1 FOR THE AMPERO MINI IS OUT. Supporters first — everyone else gets it on 5 November.

What's in it:
- XY pad: the X or Y chip no longer steps through parameters. It opens a grid of the patch's blocks (FX1…RVB, switched-off ones marked off), and inside a block a grid of its knobs with names and current values. A target is set with a tap and remembered per patch.
- Scenes: when an effect's Sync differs between two scenes, its rate now sweeps into the new range over your glide time instead of jumping (synced fast chorus → unsynced slow one).
- Fixes: Loop Sync (the half-loop jump, a preset load during loop playback), Sustainer releasing the held note on Hold → Follow, Opto Mode 50 = Limit, the pad and DICE on Pitch Parrot Delay's real range.
- New models: Uni-Vibe, Synth, Tape Echo.

How to get it: download the official V2.2 from Hotone, build it on dubshift.dev/1.0.html, flash it like a normal update. Your presets stay.

Installed it? Tell me what breaks — in the comments or in the tier. This is an early build, and the fixes from your reports go into the public release on 5 November.

Next in this wave: Stomp 1.1 (drum fills, FREEZE on a footswitch, scene glide) and Mini 2.1 (our own firmware, USB audio, EXT in/out, the FX library).

Dubshift now has an official Discord community!

 Join us for:

 — Dubshift firmware development and new device features
 — Research, testing and development tools
 — Bug reports, ideas and user support
 — Project news and releases

 Whether you want to contribute, test new features, share your creations or simply follow the project—you’re welcome.

  https://discord.gg/SuRZC6kx

🟢 Dubshift 1.1 for the Ampero Mini is out for everyone.

The XY pad no longer steps through parameters. Tap the X or Y chip and you get a grid of the patch's blocks - FX1…RVB, switched-off ones marked off. Tap a block and you get its knobs with names and current values, ten per page. A target is set with one tap and it's remembered per patch.

Scenes stopped jumping. When an effect's Sync differs between two scenes, its rate now sweeps into the new range over your glide time instead of snapping. Intermediate values never end up in the scene.

Fixed: Loop Sync (the half-loop jump, and a preset load during loop playback), Sustainer letting go of the held note on Hold → Follow, Opto Mode 50 = Limit, scenes with a different Sync/Rate without warble, the XY pad and DICE on Pitch Parrot Delay's real range.

Three new models: Uni-Vibe (MOD), Synth (FX1/FX2), Tape Echo (DLY). The rest of the models this line offers already shipped in 1.0.

How to get it: download the official V2.2 from Hotone, drop that file on dubshift.dev/patch, flash the result like a normal update. Your presets stay, going back is the official file again.

Flashed it? Tell me what breaks - which pedal, which build, what you did and what happened. Reports from here go into the next build.

Next on this line: Stomp 1.1 (drum fills on a footswitch, FREEZE on hold, scene glide) and Mini 2.1 (our own firmware: USB audio, EXT in/out, our own routing and LIVE pages).