Specification :

RP20
include original adaptor convert 110v to 220v , manual book and softcase

The GNX2 includes many of the features found in the RP20 plus multi-modeling!

The RP20 Valve is the first ever, fully programmable Tube Guitar Preamp/Multi-effects floor processor for studio or live applications. It was designed to provide you with great Valve preamp tones and lush digital effects at your feet and finger-tips. This is achieved by having easy-access parameter controls directly in front of the user, providing instant control over principle aspects of their sound. The digital effects of the RP20 Valve can be moved around within configurations, giving the RP20 Valve the best combination of flexibility and ease of use. A unique feature in this product is its Dual distortion paths. The RP20 Valve has the ability to run Tube and Solid State Distortions in parallel. They can even be panned hard Left/Right to produce mammoth guitar sounds. These dual paths also allow very smooth morphing from Clean to Distorted tones. The S-DISC II offers a seemingly endless menu of pristine digital effects, that can provide the user with almost any effect imaginable. The RP-20 Valve is the only Tube preamp/Multi-effects floor processor of its kind. Also featured a custom LCD display along with button illumination.

review : http://reviews.harmony-central.com/reviews/Effects/product/DigiTech/RP-20+Tu be+Preamp%2FProcessor/10/1