I've been having loads of trouble finding the ES2 feature on logic express. I'm running Logic Express 9 with OS X 10.7.2 and I'm wanting to use ES2 (which I have seen featuring on many youtube tutorials), but I just can't seem to find any way of accessing it. even the help page on the application doesn't say where to find it. any help would be much appreciated.

Yes, the ES2 is in Logic Express. Create a Software Instrument. Then hold down one the bar above the output on the Software Instrument channel. This will give an option of a software instrument to use. The ES2 will be here.

Alright, thanks for the help!