Game Gear 移植版 v0.0.2：实现背景音乐支持

🎵 What’s New in Version 0.0.2

This major update brings full background music to the Game Gear port! Instead of down-sampling the 16-bit Sega Genesis FM audio, the soundtrack was converted directly from the original MS-DOS track files and adapted specifically for the Game Gear’s 4-channel PSG sound chip.

🎧 Track List & In-Game Placement

🛠️ How the DOS Music Was Converted to PSG

Because MS-DOS tracker songs used sampled instruments while the Game Gear hardware relies on programmable square waves and noise, the music conversion engine (tools/psgmusic.py) uses specialized sound design techniques:

• Channel Allocation: Uses 3 pulse channels (lead, chord arpeggios, and bass) plus 1 noise channel (drums).
• Fast Arpeggios: Polyphonic chord samples from the DOS source are rendered as high-speed arpeggios across pulse channels.
• Smart Bass Transposition: Basslines are transposed up one octave to fit within the Game Gear PSG chip's frequency floor (A2 / 110 Hz).
• Custom Dynamic Drums: The noise channel switches between a deeper buzz for kick drums and white noise hits for snares, hi-hats, and cymbals.
• Dynamic SFX Ducking: Sound effects (jumping, firing, taking damage) borrow the least critical music channel. While a sound effect plays, the background music keeps silent time in the background and resumes seamlessly when the effect completes.

🧪 Performance & Build Requirements

• Zero Frame Drops: The music engine consumes only ~4% CPU time per frame, allowing the gameplay loop to maintain a full 60 FPS speed.
• Building with Music: To compile jazz.gg with full music support, place the original DOS shareware song files into ~/jj1data (or point the JJ1_DATA environment variable to their location) before running make.

Files

Get Jazz Jackrabbit for Game Gear