Session Bouncer

Every track, and why

“Folders only” automatically keeps folder rows. Separator-style tracks are premarked as folders; adjust the Folder column if needed. Tick Keep to override. Select several rows at once: click a row, Shift-click to extend, drag across rows, or Ctrl/Cmd-click to add; then use the buttons that appear. Shift-click a Keep or Folder box to tick everything in between. Edit a name to rename it; your renames stay put when you change the rules above. Marked tracks wear a marked badge.

Stem export steps

This guide covers the separate Stem Printer script, stem_printer.py, which you run yourself on your own Mac. Nothing on this page runs Python or touches Pro Tools; Session Bouncer only builds the stem-name list in your browser.

The commands below use the filename prefix you type in box 5 at the top of the page.

Jump to:One-time setupEvery sessionPre-flight checklist

1. One-timeGet the script and install PyAutoGUI

   Download stem_printer.py

   Save it in your Downloads folder, then open Terminal (Cmd+Space, type Terminal) and run:

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2. One-timeLet Terminal control your Mac

   In macOS System Settings, open Privacy & Security → Accessibility and switch on Terminal (or your terminal app). Restart Terminal afterwards. Approve any prompts to control Pro Tools or System Events.

3. One-timeSet up Bounce Mix

   In Pro Tools, press Option+Cmd+B and set:

   • Mix Source: your main output (for example, A MON L/R)
   • File type: WAV (or AIFF), plus your bit depth and sample rate
   • Offline ON
   • Import After Bounce OFF
   • File Destination: Session Folder. Pro Tools saves these bounces in the session’s Bounced Files folder, which is the folder you’ll give the script during setup.

   Click Bounce once or Cancel. Check that you have enough disk space for every stem.

4. Every sessionBuild and review your stem list

   Load a PTX session, a session-info text file, or a screenshot, then review the imported names. Separator-style names such as -drums- are treated as folder rows for this workflow; correct any Folder checkboxes that were misidentified.

   Turn on Folders only to automatically keep folder rows. Need a click stem too? With Folders only on, tick the Folder box on your click track’s row in the table so it’s kept; the click entry goes first, as 01-click-129 when the tempo can be read from the track names, otherwise 01-click. Edit any output names, then copy the line.

5. Every sessionPrepare the session in Pro Tools

   Open the correct session. Close the folders and shrink the track heights so every folder’s Solo (S) button is visible at once. Don’t scroll or move tracks afterwards, because the script saves screen coordinates.

   Make sure nothing is soloed, then make a Timeline selection over the range you want to bounce.

6. Every sessionConfigure the script

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   Paste the comma-separated line you copied from Session Bouncer. For each name, hover over the matching Solo button in Pro Tools, then press Enter in Terminal without moving the pointer. When prompted, drag this session’s Bounced Files folder from Finder into Terminal and press Enter.

   The script saves the names, coordinates, and output folder in ~/.stem_printer.json. Run setup again for a different session, or whenever the track layout or Solo-button positions change.

7. Every sessionTest the first stem

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   Confirm the displayed list is for the correct song, then press Enter. The script waits five seconds before switching to Pro Tools. Check the first bounced file for the right content, start and end range, format, and filename before continuing.

8. Every sessionRun the full batch

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   The prefix goes on every output filename. Keep Pro Tools visible and unchanged while the script runs. It waits for each new WAV/AIFF file to stop growing before moving to the next stem.