Thank you, Markos!
This is what I wrote in the blurb for my edition of the Greek Ollendorff:
This book approaches ancient Greek through the verbal repetition of a progressively or perpetually growing repertoire of phrases and idioms, which is Henri Ollendorff's methodology, a nineteenth-century German grammarian.
Markos asked me to make recordings of the exercises because he thinks (and I agree) that they may help people speak the language. As I wrote, they contain a lot of repetitions of basic vocabulary.