On-board studio quality reverb. Reverb gives you a sense of the space that you are in. A dry guitar signal can sound a little dull. Adding the right about of reverb provides the guitar signal with ambience and brings it to life.
This socket allows you connect an external sound source of your choice and can be used for playing backing tracks into your unit. Please not the volume of music/backing track is controlled by the volume on the external sound source itself.
FX loops are important as they allow you to add effects to the signal path in a specific place between the pre-amp and the output section on an amplifier. This is where FX loops are important as it allows you to put time-based FX after the distorted pre-amp section. For example, delayed distortion sounds different to distorted delay – try it.