GR Synth

About

GR Synth is a native industrial FM synthesizer for iPhone. Shape unstable machine tones with deep frequency modulation, pitch sweeps, noise, distortion, bit crushing, resonant filtering, delay, and atmospheric reverb. Explore 21 curated, read-only built-in presets—including Kolyat calling customer service—or create personal presets that stay on your iPhone. Trigger machine phrases and individual notes, connect to a DAW through USB audio and Core MIDI, and render 48 kHz stereo WAV files for Files, AirDrop, and production workflows. Ringtone Mode repeats the current sound while GR Synth is in the foreground. Edit the synth while it runs and each new repeat uses the latest controls. Choose 1–20 repeats and 1–30 seconds between triggers, then export the complete timed sequence as one WAV file. Ringtone Mode does not install or replace an iPhone system ringtone. FEATURES • Native low-latency stereo synthesis • Deep FM, pitch sweeps, noise, distortion, filtering, delay, and reverb • 21 bundled, read-only built-in presets • Private on-device preset saving • Foreground-only repeating signal mode with live editing • Full repeating-sequence WAV export • Core MIDI input and virtual destination • USB audio workflow for recording into a Mac DAW • Offline 16-bit, 48 kHz stereo WAV export • Sticky Play Machine Phrase control while editing sounds No account or network connection is required.