Hey guys, I have this horrible problem. My guitar has a low hiss whenever I try and use any mid to high gain amp simulation. I'm going direct input on my interface and connected to my Mac via usb. I took off the cover to the wiring and everything is connected firmly, and I tightened any loose parts, but the hiss is still there 
Any tips from the pros? I'm still quite new to this stuff. I just found out today what an impulse was.

Any tips from the pros? I'm still quite new to this stuff. I just found out today what an impulse was.