carolin gave me an answer to this exact question, which i really liked:
the recording should begin "within a heartbeat", and feeling is what is needed - more than measuring it.
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cc welcome! my skills improve from pl notes that cite when my english pronunciation is way off, or when words are missing.
en: lay down your arms, essays on art by goethe
de: sammlung prosa, hoffmann: sommerfrische, rousseau