[email protected] is too little time for a VI buffer. There have started to be Kontakt instruments that REQUIRE [email protected]–which equates to [email protected] Disk streaming samplers bottleneck is single core CPU speed and RANDOM seek disk access time. The message amount to “something prevented the buffer from being filled in time”. Id guess its disk since thats such an elderly VI….I kind of doubt they're doing heavy handed input scripting. We could troubleshoot it, but whats problematic with setting it to 256 or 512? I run my box at 512 pretty much full time-and i refuse to play VI keys north of hardware latency. If i set it lower, its for an amp sim. Granted, this is on an RME PCIe….so, its LITERALLY 512 samples….where CoreAudio+USB/TB will add time and make it “feel like more”-so your 256 might be closer to my 512 in actual latency….etc….anyway, even if for those reasons, it ends up too latent for you, that would be the first trouble shooting—does more linear time alleviate the issue?