Does Pedalinho work on an iPhone or iPad?

No. Every browser on iPhone and iPad is WebKit, and Apple does not provide Web MIDI, so a pedal cannot be reached from those devices. Use Chrome or Edge on a Mac or Windows computer.

Which pedals can Pedalinho edit?

Twenty-one families: BOSS Katana MkII, Katana MkI, Katana Gen 3, GT-1000, GT-1B, ME-90; Zoom G5n, MS-200D+, MS-50G+, MS-60B+, MS-70CDR+, MS-80IR+, MS-50G, MS-60B, MS-70CDR, B1on; Valeton GP-5, GP-50, GP-200; Hotone Ampero; Sonicake Pocket Master, plus a generic SysEx editor.

Can it write patches, or only read them?

Both. A family is marked confirmed only after a bench session with the physical unit; on documented families the app asks the pedal to identify itself before it writes.

Does it need an account or an installation?

No. It runs in the browser and talks to the pedal over the USB or Bluetooth connection you already have; nothing is uploaded.

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Your pedals, on the screen,
while you play.

A browser editor for twenty-one guitar and bass multi-effects families — BOSS Katana, GT-1000, GT-1B, ME-90, Zoom MS, MS Plus and G-series, Valeton GP, Hotone Ampero, Pocket Master. Read the patch that is in the pedal, change it, write it back. Nothing to install, no account, nothing uploaded.

Open the editor →

21 device families (4 with fixture tests that pass) · read and written, over the cable you already own · each family marked confirmed only after a bench session with the real unit.

One app, twenty-one editors

Each family gets the editor its own protocol deserves, not a generic slider grid.

BOSS — Katana MkII (full editor, confirmed on hardware), Katana MkI (built from the published map; nothing is written until the amp identifies itself), Katana Gen3 (read and write; the amp identifies itself before anything is written), GT-1000 (parameters rendered live from the unit), GT-1B, ME-90.
Zoom — G5n and MS-200D+ (both confirmed on hardware); the MS Plus line, MS-50G+, MS-60B+, MS-70CDR+ and MS-80IR+, on the 200D+'s protocol; MS-50G, MS-60B, MS-70CDR, each with its own parameter map; and the B1on.
Valeton — GP-5 over Bluetooth, and the GP-50 and GP-200 as pilots.
Hotone — Ampero: what the unit confirms it can read, nothing more.
Pocket Master — Bluetooth LE, its own command library rather than MIDI.
Generic MIDI — a raw editor for anything else that speaks SysEx.

Open the editor →

What you can actually do

Read a patch off the pedal and see every control on one screen, not a menu tree.
Change it and write it back while you play.
Keep a library of patches, and send any of them to any channel.
Translate patches between devices — a preset built for one family, mapped onto another.
Run a setlist, step through songs and tones, tune with the amp's own USB audio, and play along with a backing track.

Patch files, plainly

Supported means a real file has gone in and come back out unchanged. Everything else says what it is.

Katana MkII .tsl — supported: a real BOSS Tone Studio liveset is read and written back with every key and value intact.
Katana MkI .tsl (the older file BOSS labels “GT”) — documented: read from the published format; no real file has proven the round trip yet.
Katana Gen 3 .tsl — recognised, not installable yet.
Zoom patches saved as .tsl — named as Zoom patches, not imported as BOSS livesets.

The Pedalinho editor with a BOSS Katana patch open: the amp panel and the whole effects chain, every value read from the pedal. — The whole Katana on one screen — read from the amp, written back as you turn a knob.

The tuner: a deviation meter, a Play a String prompt and a Start button. — The tuner, using the amp's own USB audio.

Pitch Bird, a tuner game: a vertical scale of notes from E2 to E4, with a bird steered by playing the note in each gap. — And a silly one: Pitch Bird — fly the bird by playing the notes.

Before you click

Use Chrome or Edge on a desktop computer. The connection needs Web MIDI, which Safari and Firefox do not provide. On an older Chrome the page will say so rather than fail quietly.
Connect the Katana by USB and switch it on.
If the browser asks for permission to use MIDI devices, allow it — that is the cable.

What it does

Reads the patch on the amp and shows the whole chain on one screen — amp, boost, the effects, the delays and the reverb, with real values instead of raw numbers.
Changes travel to the amp as you make them. Save when you are happy.
Works on the Katana MkII. Read-only where a control has not been confirmed on real hardware — it says so rather than guessing.

Honest notes

This is a personal project, not a product. It is not affiliated with, endorsed by, or connected to BOSS or Roland; product names are used only to say what it talks to.
Anonymous usage telemetry is collected — which screens are opened and whether operations succeed — so failures get found. No accounts, no personal data, no audio, nothing sold.
It is young. If something is wrong, a wrong value is worse than a missing one, so controls without confirmed addresses are deliberately not writable yet.

Your pedals, on the screen,while you play.