SynthBridge

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About

Play any MIDI keyboard wirelessly via Bluetooth or USB — SynthBridge turns your device into a studio-grade sound module with ultra-low latency. Load SoundFont files, add reverb/chorus/distortion effects, record performances, and play back MIDI files with synced lyrics.

Whether you connect a BLE MIDI keyboard, USB MIDI controller, or use the built-in touch piano, SynthBridge delivers professional audio quality powered by the Oboe/AAudio engine. Ideal for live performance, music production, practice sessions, and MIDI file playback.

All core features are completely free — MIDI connectivity, SoundFont loading, effects, recording, and playback at no cost.

MIDI Connectivity

• BLE MIDI (Bluetooth Low Energy) — wireless connection to MIDI keyboards and controllers
• USB MIDI (USB OTG) — direct connection via USB cable
• Virtual MIDI Device — inter-app MIDI routing
• Multiple simultaneous device connections

SoundFont Support

• Load custom SF2/SF3 SoundFont files
• 261 instruments + 13 drum kits built-in with high-quality sounds
• 16-channel multi-timbral synthesis
• Bank/Program change support
• Per-channel volume, pan, reverb, chorus controls

Professional Effects

• Reverb — adjustable room size, damping, width
• Chorus — customizable speed, depth, voices
• Distortion — drive and tone controls
• Echo — time, feedback, and decay parameters
• Master gain and polyphony control (16–1024 voices)

Performance Tools

• Multi-touch piano keyboard with adjustable octave range
• 8 programmable drum pads
• Pitch bend and modulation wheel support
• Customizable velocity curves (Linear, Exponential, Logarithmic, S-Curve)
• Metronome with adjustable BPM

MIDI Library & Player

• Built-in MIDI file library with folder scanning
• Playlist management with shuffle and repeat modes
• Playback speed control (0.25x to 4.0x)
• Lyrics display — supports embedded MIDI lyrics and external LRC files
• Real-time lyric synchronization during playback

Recording & Export

• Real-time audio recording with full MIDI data capture
• Export recordings as WAV files
• MIDI file export with pitch bend and modulation data
• MIDI-to-Audio rendering — offline WAV export directly from SoundFont

Ultra-Low Latency Audio

• AAudio MMAP support on Android for ultra-low latency
• Oboe audio driver integration
• Configurable buffer sizes
• Exclusive mode for professional performance