09/14/2026
I gave GPT-6 Astra one prompt in the Codex app: write something eerie into a marked section of my song, bars 9 through 24.
There's a track in the session labeled Mysteria that hasn't been Mysteria in a long time, it's Heavyocity Dystropia now. Astra called it Mysteria too, I corrected it in the chat, and it went to work on the right instrument. It read the printed bass and guitar without hearing the song and planned a slow, unsettling melody over sustained open intervals.
Three and a half minutes later it had written 22 notes on that track, and it got the root notes perfectly. I EQ'd it, ran it through elysia karacter, THE OVEN, and a Purple Audio MC77, and REAPER crashed on me four times while I mixed it. The autosaves kept the session, and Astra's part was still there.
REAPER Daemon is how Astra read and wrote into the session. It's free and open source: https://www.deadpixeldesign.com/workflows/reaper-daemon/
Source and setup: https://github.com/wretcher207/reaper-daemon