RollTab
What it is
A free iPhone app that autocompletes your piano playing in real time. Simon Edwardsson trained a 125M-parameter decoder-only transformer on a few hundred thousand MIDI files of classical piano — custom note tokens for pitch, onset delta, duration, and velocity — post-trained it with DPO judged by Gemini 3.5 Flash, and quantised it to INT8 Core ML, where it generates around 108 notes a second on an iPhone 15 from live MIDI input.
Featured in
Issue #10 — Out of the Sandbox · — the full issue has that week's other tools, reads, and big-lab releases.