Tonight I tried to use a Realtrack that had an Amplitude guitar in it (or at least had 'Amplitude' in the name of the realtrack). There was a hiss every couple of bars that I assumed meant that Amplitude isn't registered. I found an old video on the PG Youtube channel that shows how to register the plugin, but it's out of date, and IK Multimedia's website is different, and there are lots of Amplitude plugins but not a '3'. I've had to admit defeat and hope that someone can show me how to authorise the plugin (assuming that's the cause of the problem). A box flashed up saying that the input and output sample rates are different too - wish I was a bit more enlightened with that sort of thing, but I don't know what that means or how to fix it?
Any help much appreciated!!