Ok, here's the drums dry:
...and here's the same track, with my reverb bus unmuted. You can here this weird quarter note or half note echo in there that's definitely not present when I'm playing back.
I'm mixing in 88.2, the Bricasti samples are 44.1 and loaded in Reaverb, and I'm mixing down to 44.1 with dithering engaged. Any thoughts?
And this is in playback as well?
Check the latency on the IR in reaverb. Might not be handling it correctly, so youre hearing the verb delayed. There is a corresponding setting. I forget its name cos I use perfect space in reaper, but theres an offset you can control.