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Separate audio stems in batches with Google Sheets

Started by a clock, and works across Gmail and Google Sheets. 15 steps, 2 branches, 1 loop or waits: a working afternoon to understand properly.

Medium

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15 stepsMedium: a working afternoon
2Branches: places the flow splits
1Loop or waits
2Services it connects to

The flow

Starts it 2Logic 5Service 8

The steps in the order they run, from what starts it.

  1. 1When clicking 'Execute workflow'Manual triggerStarts it
  2. 2Every 6 hoursSchedule triggerStarts it
  3. 3StemSplit: check creditsStem SplitService
  4. 4Enough credits for batch?IfLogic
  5. 5Google Sheets: read queueGoogle SheetsService
  6. 6Gmail: low credits alertGmailService
  7. 7Filter pending rowsFilterLogic
  8. 8Stop if queue emptyCodeLogic
  9. 9Loop queue rowsSplit In BatchesLogic
  10. 10Google Sheets: mark processingGoogle SheetsService
  11. 11Gmail: batch completeGmailService
  12. 12StemSplit: four-stem separationStem SplitService
  13. 13Did separation fail?IfLogic
  14. 14Google Sheets: write failureGoogle SheetsService
  15. 15Google Sheets: write stemsGoogle SheetsService

How it's built

Starts on
A clock
Steps
15, with 2 branches, 1 loop or waits
Size
Medium: a working afternoon
Connects to
Gmail, Google Sheets
Model
None. This is plumbing, not judgement

Questions

What does it need to run?

An n8n account, plus your own Gmail and Google Sheets accounts. You connect your own accounts after importing it; none are included.

What starts it?

It starts on a clock.

Does it use AI?

No. Every step is fixed logic or a call to a service, so it does the same thing every time.

How long does it take to set up?

Plan an afternoon. 15 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

Before you run it

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 15 steps before you point it at anything that matters.