Download the X Space audio
I tried it anyway and was able to do it, I get m4a.
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This page is auto-translated from /nishio/X Spaceの音声をダウンロードする using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I'm very happy to spread my thought to non-Japanese readers.