Arch Carrier Instrument Lab

Explore the sound of shapes: draw resonant bodies, play them by touch or MIDI, and record your own instruments.

Draw a shape. Tap it. Hear it ring.

Arch Carrier turns drawn shapes into a playable physical modelling instrument. A ring, a plate and a tuning fork each have their own resonances. Change the outline, cut a hole or move your strike, and explore how the sound changes.

PLAY AND SHAPE • Strike up to three resonant bodies by touch. • Add and subtract material without degrading untouched contours. • Watch sand trace nodal patterns, and tilt your device to move it. • Start from five seeds or save your own instruments.

TUNE AND SEQUENCE • New shapes start at A3, 220 Hz. • Tune by frequency, semitone or octave, with note names and cents. • Audition a tuning or hear the natural model. • Place four mallets and set strength and modal focus for each step. • Choose seven mallet speeds, from 0.25× to 2×. • Record looping mallet motion, synchronized to each rhythm.

MIDI PATHS • Add editable traces with independent MIDI note ranges and channels. • Each key selects a strike position; velocity sets its strength. • Play from a connected MIDI keyboard while Arch Carrier is in the foreground. • Show the paths when you need them, then hide the overlay while MIDI keeps playing.

KEEP YOUR INSTRUMENT • Save shapes, tuning, rhythms, motion, tempo, damping, tone and MIDI mappings together. • Resume your last instrument without automatic playback. • Record stereo 24-bit WAV files and export them to Files or other apps.

Free. No account, advertising or in-app purchases. Designed for iPhone and iPad.