1 12AX7
1 DSP I think ...
The expression pedal works on optical sensor.
Stereo output
Good effects and there is everything needed for a guitarist.
Forget the compressor and the equalizer and reverb.
Strengths: The distos but not all (this may be my microphones that are unclear), the sound clear, Wammhy, Delay, the Octaver (despite a slight delay) and the color is absolutely gorgeous.

UTILIZATION

Simple, fast, classic, ca va ...

SOUND QUALITY

I talked a little higher. Light gives warmth and character "analog" sound. It's very nice to play with this object.

OVERALL OPINION

I play Live, I record and repeated with and only with the RP7 RP7. I will NEVER sells it. But anyway we are more than nine I think .....