Information:
You choose the tone! With more than 20 to choose from and more in the works, having a new amp is as simple as plugging in a new module. Start with as few as one, or purchase all  modules and have all your favorite tones right at your fingertips. All modules can be used for the RM4 preamp, RM50 combo, RM 50 heads and the RM100 head.
 
Specifications:
Features: All modules include two 12AX7 preamp tubes, gain, bass, middle, treble and level control. Each module includes bright switch for additional presence.
* Ultra (Super Hi-gain distortion. For all heavy style tones.)
* Modern (Modern Hi-gain distortion. For modern rock to nu-metal rock tones.)
* Recto (Based on Mesa/Boogie® Dual Rectifier)
* SL + (Based on hot Marshall® Super Lead)
* Plexi (Based on Marshall® Plexi)
* Top Boost (Based on Vox® AC30TB)
* Tweed (Based on 59 Fender® Bassman™)
* Blackface (Based on Fender® Blackface Twin™)
* DLX (Based on Fender® Blackface Deluxe™)
* Clean (Very warm, clean tone. Based on Class A.)
* JTM (Based on Marshall® JTM45)
* Brown (Classic hi-gain brown sound)
* the George Lynch signature modules ( 4 models )
* the Kirk Hammett Signature modules ( 3 models )
* the 1086 Don Donegan module