Changelog

0.2.0.0

New Modules

• GBSynth.SFX: 13 ready-to-use sound effect presets (laser, explosion, impact, alert, click, powerup, coin, jump, heal, defeat) plus pre-rendered drum samples (kickSample, snareSample, hihatSample). All built from synthesis primitives, no sample files.
• GBSynth.Chord: Programmatic chord construction. Quality type (Major, Minor, Diminished, Augmented, Sus2, Sus4), chord / inversion / chordProgression builders, and built-in progressions (pop1564, blues145, minorClassic).
• GBSynth.Effects: Post-processing effects — bitCrush, echo, fadeIn, fadeOut, reverseSignal, mix.

Bug Fixes

• Eliminate partial functions: tail → drop 1 in Oscillator and Synthesis, maximum / foldl1 → safe foldl' with empty list guards in Render.

Internal

• 109 pure tests (up from 60)
• Metadata: cabal-version 3.0, stability experimental, CHANGELOG.md

0.1.0.0

Initial release.

Synthesis Engine

• Oscillators: sine, square, saw, triangle, noise, pulse with configurable duty cycle
• ADSR envelope generator with attack, decay, sustain, release stages
• Instrument definition with oscillator type, envelope, and harmonics
• Multi-channel pattern sequencer with note events and rests
• Song structure: sections, tempo, time signature, instrument assignment

Rendering

• Pure PCM rendering pipeline: Song → sections → patterns → samples
• Multi-layer signal mixing with per-channel gain
• Signal normalization with configurable output level
• 16-bit mono PCM at 22050 Hz

WAV Export

• Native WAV file writer (RIFF/WAVE format)
• 16-bit signed PCM encoding
• No external audio dependencies