Tube amp sound for the modern performer. The boss waza tube amp expander brings together an extensive range of carefully developed features that will elevate your tube amp to its very best performance level ever. Itll let you really experience the power of your amp. Its advanced reactive load section allows you to crank up your amp to the max without altering its tone or having to play too loud.but thats far from all this awesome unit can do. Youll enjoy versatile tone in your amp like never before. A built in effects engine and external effects loop provide you with a wealth of sonic possibilities including reverb compressor and delay effects. Four different eqs let you shape your perfect tone. Were still only scratching the surface of its capabilities. This is sonic freedom.