An effects processor is a very powerful effects unit. These professional levels of equipment can either be rack mountable or floor pedals like the Line 6 Helix shown here. These FX processors are able to model virtually any sound a guitarist could ever want. Not only can they replicate the sound of many well known amplifiers and effects they can also mimic the sound of an amplifier recorded with different speaker cabinets and microphones. There are also professional inputs and outputs allowing direct connection to PA’s, recording and mixing desks. The convenience, versatility and sound quality of these units are making them more and more popular with professional guitarists.