How to write audio from multiple buffers OR join multiple buffers into one?

Hi,

I have a bunch of audio saved across 80+ short (~3s) buffers in a single mubu container. The data in each buffer is in a track named “offline_scaling”.

I’m trying to figure out how to either save all the buffers as individual .wav files, or just append all the buffers within a single, new buffer+track in the container.

I tried sending the message

writeall @track offline_scaling

Which returns the error: “cannot write data of multiple tracks into audio file.” The documentation says this should work though, no?

I also tried combining them by sending the test message:

join offline_scaling offline_scaling offline_scaling @name NEW @bufferindex 1 2 3

This just creates an empty track called NEW.

I’ve tried variations of each message, but to no avail. Apologies if this is a simple question, but do you have any thoughts?

Full patch here.

Best,
Ian