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Question: Hi :-) I have a question about r8brain being used in Reaper. From what I understand, r8brain doesn't operate in real-time. In cases where we're doing playback, whether for listening, recording, or even playback for outboard gear, how does Reaper handle this? Does the playback have additional latency from r8brain? And does r8brain perform fully without being adjusted to reduce its effectiveness?
Asked by tar tar tar (223.206.51.x) on May 7 2025, 7:27pm
Reply on May 7 2025, 7:32pm:
    "operate in real-time" is a bit ambiguous. It has some latency. Which is fine when reading media, because disks have (a different kind of) latency too... :) the only time it would matter is if you're converting a signal that is being monitored, which doesn't really happen unless you're trying to realtime oversample, in which case, well, you have to deal with the latency.

    The main thing we have to do some fanciness around is changing the resample rates on the fly, which r8brain-free isn't really designed for. REAPER only really does that if you use the playspeed envelope, or stretch marker tempo ramps without preserving pitch.

Comments:
  • Posted by tar tar tar (223.206.51.x) on May 7 2025, 10:22pm:
    Thanks so much! I didn’t realize playback runs through the media buffer. That explains why latency isn’t an issue during conversion :-D But for FX Instance/Chain Oversampling, does it behave like typical plugin oversamplers? Does it add latency reported via PDC? I couldn’t confirm from REAPER’s performance meter. I thought this was just a small DSP question, so I didn’t post on the forum. Sorry if it’s too REAPER-specific. Thanks again!

  • Posted by Justin on May 8 2025, 1:19am:
    it adds latency and that gets reported as PDC, yeah. forum is good for this stuff

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