Drop Forge

Drop Forge is a drum synthesizer built for Apple Pencil. Strike the 12-pad grid with six continuous dimensions of expression at 240Hz — force, tilt, roll, azimuth, and position — and hear every hit respond differently. Finger multi-touch works simultaneously for players without a Pencil. The synthesis engine generates every sound in real-time from mathematical models of analog drum circuits. Four exciter types and three filter types combine into voices ranging from tight 808 kicks to chaotic FM metalwork to resonant bell tones. No samples are used anywhere in the instrument. SYNTHESIS - 4 exciters: Pulse, Noise, FM Burst, Tri-Sine (909 VCO) - 3 filters: Comb (808), Bandpass, Lowpass - 25+ parameters per voice - 20 factory kits, 240 voice presets EXPRESSION - Apple Pencil force, tilt, azimuth, roll, and XY position - Flick gestures: pitch bend, filter sweep, choke - Draw amplitude envelopes directly on each pad - All pencil data recorded per sequencer step SEQUENCER - 12-track step sequencer with real-time recording - Per-step parameter locks - Fill mode, mutes, flams, FX trigs - 20 factory beat patterns EFFECTS - Reverb (Dattorro plate), Delay (tape-style) - Per-pad send routing - Tunable comb filter per pad AUv3 PLUGIN - Full-UI instrument plugin for AUM, Logic Pro, and Ableton Live - Host tempo and transport sync - Runs on Apple Silicon Macs via Designed for iPad MIDI - Note input (GM drum map) from controllers and DAWs - 6-axis pencil CC output at 240Hz - Clock sync with external gear 16 scene slots for full state recall. Custom kit save and load. 48kHz audio at 2.7ms latency.