Is spoken part clearly identifiable? yes — via the form field: all 97 documents carry a # form = ... value (dialog 18, mixed (form) 38, prose 40, verse 1). Documents with form = dialog are spoken; all others (mixed (form), prose, verse) are written.
Advise: add # modality = spoken to the 18 form = dialog documents and # modality = written to the remaining 79, per the Document-level metadata conventions.
Metadata review
doc (and paragraphs) metadata
Field
Advice
document_id
OK
modality metadata
Field
Advice
channel
we suggest to interpret channel as phonic-auditory, gestural-visual or graphic-visual