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Question: How would one play items from REAPER's arrange view in non linear fashion? Basically using tracks and their fx as mixer, but triggering sources programatically from multiple different tracks at the same time, using exising project item sources, or creating them from HDD)
Asked by nikolalkc (80.216.15.x) on May 7 2025, 11:36pm
Reply on May 8 2025, 7:31pm:

use playtime?

Comments:

Posted by nikolalkc (80.216.15.x) on May 9 2025, 7:23am:
Yes, like that. The question is then basically how to recreate that behavior in code. What would be the API to build that from scratch in a custom extension?

Posted by Justin on May 9 2025, 3:10pm:
it would be very complex, probably need PlayTrackPreview, make copies of the PCM_source from items, etc, too much to describe here

Posted by wasereb4 (95.91.77.x) on May 10 2025, 1:50am:
It's (I think partly at least) open source: github.com/helgoboss/helgobox
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).

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