Sliderz

A Flutter MIDI controller for iPhone and iPad, inspired by the KORG nanoKONTROL2. Control faders, knobs, transport, and channel buttons from your iOS device over USB to a Mac, DAW, or any MIDI-compatible app.

Features

• 8 color-coded channel strips — fader, pan knob, and Solo / Mute / Record buttons per channel
• Transport panel — track navigation, markers, cycle, and playback controls
• USB MIDI — send MIDI to a Mac over cable (IDAM / CoreMIDI)
• nanoKONTROL2 CC mapping — default control change assignments for DAW compatibility
• Landscape-first UI — dark neumorphic design optimized for performance use

Requirements

• Flutter SDK ^3.11.5
• iOS 13.1+ (primary target)
• iPhone or iPad connected to a Mac by USB for DAW or MIDI app control

Getting started

git clone <your-repo-url>
cd sliderz
flutter pub get
flutter run

For a clean install after icon or native changes:

flutter clean && flutter pub get && flutter run

Connect to a Mac (USB)

1. Connect iPhone/iPad to the Mac with a USB cable and tap Trust on the device.
2. On Mac: Audio MIDI Setup → Window → Show MIDI Studio.
3. Open Audio Devices, select the iPhone, and click Enable (IDAM).
4. In Sliderz, tap the settings icon and select the iPhone USB destination.
5. In your DAW or MIDI app, choose the iPhone MIDI input and map the controls.

Move a fader or knob in Sliderz and confirm MIDI arrives in your host app before mapping.

MIDI CC mapping

Default assignments follow the nanoKONTROL2 CC mode:

Control	CC
Faders 1–8	0–7
Knobs 1–8	16–23
Solo 1–8	32–39
Mute 1–8	48–55
Record 1–8	64–71
Track ← / →	40 / 41
Marker SET / ← / →	43 / 44 / 45
Cycle	42
Rewind / FF / Stop / Play / Record	46 / 47 / 58 / 59 / 60

MIDI channel is selectable from the status bar (default: channel 1).

Project structure

lib/
├── main.dart
├── core/injector.dart           # Dependency injection
├── common/components/           # Shared UI (knob, fader, button)
├── controller/
│   ├── blocs/                   # Business logic
│   ├── components/              # Feature UI
│   ├── models/
│   └── screens/
├── midi/
│   ├── models/                  # CC mappings
│   └── services/                # MIDI I/O
└── theme/

App icon

Icons are generated from assets/app_icon.png using flutter_launcher_icons:

dart run flutter_launcher_icons

Bundle identifier

• iOS / Android: com.sliderz.app

Tech stack

• Flutter
• flutter_midi_command — CoreMIDI over USB on iOS

License

Private project — not published to pub.dev.