Posted by helgoboss (46.189.45.x) on May 11 2025, 8:36pm:
Playtime is the closed-source part of Helgobox. The technique it uses is indeed PlayTrackPreview, with a custom-made PCM_source implementation that delivers the correct audio and MIDI depending on the playing clips and its positions. Not too difficult to make the basics work. But a lot of effort to turn it into a polished and performant piece of software (in my experience at least).