Unable to record drums

I have just installed GP4 (win 7) and am used to using GP 2

I followed the built in help screens and recorded a guitar track although it crackles all the way through - very annoying
The guitar recording source is from the line out of a marshall amp. The problem is not the amp, leads or guitar

Also I can seem to record any drums from synth drum kit supplied. I can hear it when I set it playing and it registers on the input level 
of the drums track but doesnt record anything. I had no problem with guitar pro 2 so this is becoming very frustrating

Phil