Musical Interface for Digital Instrument Arrangement
Digital Audio Workstation (DAW)

MIDIA is a lightweight Java-based digital audio workstation designed around intuitive MIDI sequencing.
It features:

• A timeline window for organizing tracks and blocks
• A dedicated Piano Roll editor window, opened per block in its own JFrame
• Real-time MIDI playback with a draggable playhead
• Block-based editing for structuring musical ideas
• Clean separation between timeline interaction and note editing
• Unit-tested core components and a well-organized architecture

The result is a minimal yet powerful MIDI composition tool built in pure Java.

• Create multiple MIDI tracks with customizable names and instruments
• Rename tracks, change their instruments, or delete them
• Tracks appear vertically in the timeline, each containing blocks representing musical segments

• Add blocks specifying their starting beat
• Blocks represent a section of notes to be edited
• Double-clicking a block opens a separate Piano Roll window (JFrame) for detailed note editing

Each block opens in its own floating editor window:

• Left-click: add a note
• Right-click: delete a note
• Scrollable and grid-aligned
• Plays back using the block's track instrument
• Editing updates the block in the timeline seamlessly

• Play, pause, and drag the playhead during playback
• The red playhead follows MIDI output in real time
• Adjustable BPM: click-and-drag the BPM value to increase/decrease tempo

• File → Save writes the full project (tracks, blocks, notes, BPM)
• File → Load restores previously saved sessions

1. Open Track → Add Track
2. Enter a name and select an instrument
3. A new track appears in the timeline

1. Use Track → Add Block
2. Enter the block’s starting beat
3. The block appears inside the selected track

1. Double-click a block
2. A new Piano Roll window opens
3. In the Piano Roll:
   • Left-click → add note
   • Right-click → delete note

1. Press the top-right Play button
2. Drag the timeline playhead at any time
3. Adjust BPM by dragging on the BPM value

1. Right-click a track label
2. Choose rename / change instrument / delete track

• Use File → Save and File → Load

• UI: Swing with FlatLaf
• MIDI Playback: javax.sound.midi
• Testing: JUnit
• Platform: Cross-platform desktop