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Loop Lab

Overview

A small local web interface for generating and curating short audio loops with Magenta RealTime 2 (mrt) on Apple Silicon. Type a prompt, pull four faders (Outputs / Length / Randomness / Complexity), generate a batch of variations, audition them in-browser, keep the good ones, bin the rest. Unofficial third-party front-end over Google's mrt CLI — does not bundle or modify Magenta itself.

Key files

  • loop_lab.py — the entire app (local web server + generation logic)
  • README.md — setup, requirements (Apple Silicon, Python 3.12, magenta-rt), usage
  • requirements.txt — Python dependencies
  • docs/ — screenshot.png (UI reference), Loop Lab Recording.skbundle / .mov (demo screen recording), Loop Lab - final.mp4 (recording with title + end cards), loop-lab-demo.mp4 (4.6 MB web/README version); promo-card sources live in ~/ScreenKiteWorkspace/loop-lab-cards/

Critical rules

  • Unofficial / not affiliated with Google. Keep that framing in any user-facing copy. Don't imply endorsement.
  • Generated audio (*.wav), outputs/, and manifest.json are gitignored — they are artifacts, not source. Don't commit them.
  • Brand: dark UI, magenta accent #EC1E8C, bold "LOOP LAB" wordmark with the second "O" in magenta, mono labels. GitHub: github.com/mgoldhack/loop-lab

Workflow

  • Run the app: see README.md (needs magenta-rt installed + models downloaded in a Python 3.12 venv; mrt models download).
  • Loops are generated per-prompt at varied temperature so a batch actually differs (the model uses a fixed seed).
  • Demo video editing is done in ScreenKite (see SESSION_LOG for the promo-card work and the trailing-overlay limitation). Captions were added outside ScreenKite via headless-Chrome PNGs + ffmpeg overlay (this ffmpeg has no drawtext/libass) — see memory video-captioning-ffmpeg.