SubverseLab is a platform for music producers: free browser tools, an Ableton Live connection and audio plugins in one place. Measure a mix (LUFS, peaks, spectrum), split stems and read key and BPM, plan an arrangement, generate MIDI drums and synth patterns, and turn a track into a 1080p video. Loom, an open-source MCP server, connects Claude to Ableton Live. Launching today with two new plugins, KUBBE (reverb) and KASET (tape colour), free for the first 1,000.