Maybe you should(if you already haven't) check out the digitech Sound Community.
http://www.digitech.com/soundcomm/guitar_list_messages.asp?productid=205
you might find some advice there.
hope it helps :)
[FONT=Century Gothic]RSAM16[/FONT]
[FONT=Times New Roman]GuitarTricks Resident Eric Clapton Fan[/FONT]
[FONT=Times New Roman]GuitarTricks Resident Eric Clapton Fan[/FONT]