I have a 500HDX and am looking for a simpler interface. One thing that comes in handy of the 500X when playing through a guitar amp using the 4 cable method is the ability to use a pre-amp model in the 500HDX and then using the FXloop to buy pass the guitar amp preamp and only using the power amp portion of the guitar amp. I see on the firehawk you can select "no amp" but is there away to use model preamps as I described on the 500HDX?