For years I’ve wanted to build a super-dense electronic-music compressor: keep only the loops and phase cues that really matter, then re-synthesise the track perfectly. Evenings and weekends, however, were never long enough to design the model, write the maths, and wrangle PyTorch. Recently I opened ChatGPT running the new o3 model and treated it as a design partner. If we could keep the conversation focused, perhaps we could sketch—and prototype—the entire idea in a single stretch. Co-designing...