Hi John - thanks for your reply and I really appreciate your efforts to help.

I do have BIAB but rarely use it and I don't have RB so my problem here is really to do with recording, editing and mixing with PowerTracks.

One of the main reasons I need ASIO is because, as you'll know, it's impossible to overdub with instrument or vocals if what you hear in the headphones is lagging behind what you're actually playing. Likewise, when I'm editing or mixing, I need the playback to flow smoothly and be able to hear any changes immediately.

We've tried changing the ASIO drivers, buffer sizes etc., etc., but so far with no success.

Today I even tried uninstalling PT 2012 and going back to 2010 (which used to work fine) but the problem was still there.

Bizarrely, I also have Cubase LE4 that came free with my Alesis USB device. I don’t find it particularly easy to use which is why I favour PowerTracks, however I thought I’d try that and it’s working perfectly, even with the Alesis buffer setting back to where I used to have it – 256! At least I know I can use this if things get tight!