Basically, just don't use the metronome. Also, if you are going to add MIDI to the project, make sure IQ is turned off. (Input Quantize). It's in the main toolbar and literally is an icon that shows IQ on it. And..just to be safe (you shouldn't HAVE to do this in most cases), on the Audio Track, click the "i" towards the upper left if your screen (or hit F4 on your keyboard) and make sure tempo is set to "Don't Follow." Again, you should not HAVE to do this unless you purposefully are using timestretch, but that will turn off all of the Tempo and Quantize features that could happen upon recording.