Diezel Herbert Synergy tube preamp modul. With the Synergy Diezel Herbert Preamp Module, you get all the tonal nuance of the original 180 watt bone-crusher, in a modular package. You have access to the same searing guitar tones that have made the Diezel brand one of the most respected names in the amp industry. But this is no mere emulation. Peter Diezel personally designed the module, ensuring your tone sings with the authentic grind and character of its namesake amp. This 2-channel design boasts independent 3-band EQ, mid-cut knob for blue and red channels, allowing you to fine tune separate lead and rhythm tones.