Control Logic Pro with Python: what actually works

Published August 2026

The straight answer first: Logic Pro has no Python API. No scripting surface, no project-level automation, no plugin SDK that reaches the arrangement. If "control Logic with Python" means puppeting the running app the way you'd drive a browser with Selenium — that option does not exist, from any vendor.

But most people typing this query don't actually need to move Logic's playhead from code. They need one of three programmatic things: read what's in a Logic project, create a Logic project from code, or transform one — and all three work today, because they operate on the project file instead of the running app.

What Apple gives you (and why it isn't this)

Logic ships exactly one scripting surface: Scripter, a MIDI-FX plugin that runs JavaScript inside a channel strip. It sees MIDI events flowing through that one strip in realtime, and nothing else — it cannot read the arrangement, add a track, or touch another region. It's a creative MIDI processor, not an automation API. Beyond that, Logic's AppleScript dictionary is close to empty, and macOS UI scripting (simulated menu clicks) is the kind of thing that breaks on every point release. Neither is a foundation to build tooling on.

The surface that does exist: the project file

A .logicx is a macOS package — a folder — whose project data is an undocumented binary format (the details are in inside the .logicx file format). Doseedo maintains a native parser and writer for it, exposed over a plain HTTP API, which turns "control Logic with Python" into ordinary requests code:

import requests, time

API = "https://api.doseedo.com"
H = {"X-API-Key": "dsk_live_..."}  # doseedo.com/settings/api-keys

# 1 — presign, then upload the zipped .logicx project folder
r = requests.post(f"{API}/api/upload/r2/signed-url",
                  params={"filename": "MySong.zip",
                          "content_type": "application/zip"},
                  headers=H).json()
with open("MySong.zip", "rb") as f:
    requests.put(r["upload_url"], data=f,
                 headers={"Content-Type": "application/zip"})

# 2 — convert it (12 directions: logic|ableton|fl|reaper, any pair)
task = requests.post(f"{API}/api/convert", headers=H,
                     json={"source_key": r.get("path") or r.get("key"),
                           "direction": "logic2reaper",
                           "async": True}).json()["task_id"]

# 3 — poll, then download the finished project
while True:
    s = requests.get(f"{API}/api/convert/status",
                     params={"task": task}, headers=H).json()
    if s["status"] in ("done", "error"): break
    time.sleep(5)
out = requests.get(f"{API}/api/convert/result",
                   params={"task": task}, headers=H)
open("MySong_reaper.zip", "wb").write(out.content)

That example converts Logic → REAPER on purpose: an .rpp is plain text, so once the conversion lands, your Python (or your AI agent) can parse and edit the session as text — track names, region positions, MIDI, tempo — then run the reverse direction, reaper2logic, to get a native .logicx back. Structural edits survive this loop; automation, sends and plugin state travel at full fidelity only on the direct Logic↔Ableton directions, so keep the text round-trip for arrangement work.

Creating a Logic project from code

The other direction needs no source project at all. POST /api/audio-to-session takes an uploaded mix and returns a native .logicx: separated stems on named tracks, a detected tempo map, optional per-stem MIDI and a chord guide track. One call, about four minutes, and the artifact opens in Logic. The audio-to-session page shows what comes back.

The honest decision table

• Trigger transport, tweak a fader on the running app: not possible in Logic from any external API. (Ableton is different — see controlling Ableton with Python.)
• Read what's inside a project: upload it — it opens as a playable browser session, or converts to formats you can parse.
• Edit a project from code: the REAPER text round-trip above, for structural changes.
• Generate a project from code: audio-to-session, or convert from a format your code can write.
• Process realtime MIDI inside Logic: Scripter — JavaScript, not Python, and only that.

Related

• The Doseedo MCP server
• Inside the .logicx file format
• Edit Logic and Ableton projects with Claude
• Control Ableton Live with Python
• Convert Logic to REAPER