I got the best results with the firehawk fx loop placed between volume and mod/delay block. No Amp/Cab sim, fx loop in stomp mode output in line mode, fx send and return level at 0 db, overall volume (the big knob) at 9 o'clock. If you want to use the FH amp sim you can turn of the FH fx loop to bypass the pteamp of your real amp. FH fx send to amp guitar in; guitaramp fx send to FH fx return; FH main oout to guitaramp fx return. Sounds great!