v0.3.0 — Responsive UI, panels, ProTracker effects

Highlights

• 🎨 Responsive UI: vim-like StatusBar + right SidebarPanel + scaled PatternDraw
• ⌨️ Tab toggle between PLAY (tracker) and SAMPLE views
• 🎵 4 ProTracker effects: Set Speed/BPM, Set Volume, Volume Slide, Position Jump/Pattern Break
• 🧪 75 tests (was 53), zero rubocop offenses
• 🏗️ Hash-based effect dispatch for extensibility
• 📦 DR 6.x only (dropped 2024)
• 🔤 JetBrains Mono Nerd Font

Bug fixes

• Pattern navigation to last position no longer crashes
• Cursor alignment pixel-perfect on current position
• Channel keys 1-4 use proper DR key names

🤖 Generated with Claude Code

v0.2.1 — Fix keys + tempo effect

Fixed

• Reload key: F5 → W (F5 not valid in DragonRuby)
• Channel mute keys 1-4: use word names (one, two, three, four)
• Tempo: correct Amiga-to-DR conversion (was hardcoded 10, now 7 frames)

Added

• Effect 0xF: Set Speed (1-31) / BPM (32+)
• PatternTempo and PatternInput modules
• 5 tempo conversion tests (58 total)

v0.2.0 — Audio fixes, 53 tests, zero rubocop offenses

Changelog

All notable changes to dr_mod are documented in this file.

[0.2.0] — 2026-04-04

Fixed

• Sample data corruption: Amiga word-to-byte conversion (×2 missing) and
  pattern_count off-by-one caused every sample to read wrong data (#33)
• Sample frequency: replaced broken custom_rate with Amiga PAL formula
  hz = 7093789.2 / (period * 2) (#29)
• Sample looping: one-shot lambda prevents infinite playback loop
• Sample indexing: ProTracker 1-indexed samples (0 = no instrument) (#31)
• Finetune parsing: signed 4-bit (-8 to +7), was read as unsigned (#34)
• Finetune applied: frequency adjusted by 2^(finetune/96) (#34)
• Sample volume: mapped ProTracker 0-64 to DragonRuby gain 0.0-1.0 (#35)
• Visual alignment: colored bands now aligned with pattern text (#20)
• DR 6.x compatibility: replaced dynamic load_dep_files with explicit requires (#41)

Added

• Pattern loop mode: press L to repeat current pattern (#45)
• Channel mute/unmute: press 1-4 to toggle channels (#44)
• Hot reload MOD: press F5 to reload MOD file without restart (#36)
• Sidebar shortcuts: display current key bindings and state
• 53 unit tests: Cell, LoadTool, Sample, Song parsing (was 4) (#28)
• GitHub Actions CI: rubocop + reek lint on push/PR (#40)
• Lefthook pre-commit: rubocop + reek + dr_spec (#15)
• Architecture docs: Mermaid class diagram and data flow (#24)
• Code style guide: anti-parentheses, Sandi Metz rules (#14)
• Reek config: adapted for DragonRuby patterns (#27)
• Blog drafts: MOD file layout bugs, ProTracker finetune, sample indexing,
  lefthook-driven refactoring with AI

Changed

• Rubocop: 93 → 0 offenses (#14)
• Reek: 124 → 32 warnings (#27)
• Pattern player: uses real MOD samples instead of hardcoded WAV files
• 6 modules extracted: CellInfo, SfxDraw, PatternDraw, PatternSideBar,
  PatternAudio, SfxDraw (Sandi Metz: 5 lines/method, 100 lines/class)
• README: updated with all controls, git flow, dev setup

Removed

• Dead code: start_game, sine_wave lambda, debug puts
• Floating methods outside Cell class
• Dynamic load_dep_files (DR 6.x incompatible)

[0.1] — 2024

Initial version. Basic MOD file loading, pattern display, sample view.