MikeM wrote
Should I be changing this in Reaper?
Probably - or in your soundcard driver software. I don't know reaper. Search the help for "latency".
Tailon. wrote
the xonars strong point is output sound , recording has mad latency and terrible recording sound aswell . asus reckon latency issues will be sorted out in later driver version but for now you xtuck with a rubbish recording card
Strengthening my case for sticking with audio cards made by audio companies, not computer hardware companies - priorities are different.