It’s true that Den didn’t create the playback engine itself — he’s using an existing sampler (like many sound designers or synthesis developers do).
However, a new synthesis method doesn’t require a new engine, only a new approach or algorithm for sound creation using existing tools.
Think of how FM synthesis became a patentable method in the 1970s — not because Yamaha built a new DAC, but because the structure of the frequency modulation process was new.
