I ran your script using the ambisonices ladpsa plugin on a pretty big file (50 MBytes like yours, I think). You have 3 or 4 temp files for the src conversion, 4 or so for the ambisonics output, then 6 for the channel swapping while writing a 6 channel file at the end -- 10 or more files, one about 200 MBytes. So I think the directory listing you sent is what I'd expect -- you need about .5 GByte of free disk space to do this edit. It seems to me that you could save all but 4 of those temp files if your ladspa plugin could write directly to the 6-channel output, rather than having to go first to a 4-channel temp file. Ideally, it would accept a function as a reader, and a function as a writer, and then the edit could be done straight through with no temp files at all. Even better, rewrite the plugin in scheme!
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