Hey guys. I've just run into a latency issue on what I thought was a perfectly working set up I'm running a Firestudio Project 0 latency interface into my pretty standard PC. PC can handle HUGE projects ok. However, one thing I have never happened to do until now is Input Monitoring within Sonar. This means I mute the input from the Presonus and do not hear it until I turn Input Monitoring on in Sonar. I am now hearing the Sonar sound instead of the interface. Latency playing through here seems fine - now the reason I got round to doing this is I am using amp sim plugins for the first time to record some DI tracks for later re-amping. I've jammed with amp sim plugs before with Input Monitoring and latency was fine. However, when the project is playing (that is, playing or recording) latency has become an issue. The Sonar sound of my guitar comes in about 500ms late This is also without the amp sim plug turned on. It's worth noting this only happens when my project reaches a certain complexity. This particular session has 8 drum tracks with full mixing on about 10 busses, about 20 plugin fx on the busses, plus my guitar in track. If I disable all but 3 of the plugins, I can play my guitar during playback/record. Hit the 4th, and latency becomes slightly audible. Question is...why This is not a big project for my PC, performance meters are all good. Halp please EDIT: Don't know if it's normal or not, but if I try and record a track with this latency, whilst it's somewhat offputting, the result recording IS in time on playback. It's purely live it's an issue.