The tech 21 sansamp is a pedal that is always in my kit box at every gig. Very handy to have as helps out in many scenarios. The through Di when the pedal is not in use is very good and clean leaving you to send a good unaffected signal to the sound desk. Then you have up to 3 further saved sounds to work from at any given point without any adjustment allowing you up to 4 different tones even within one song with only just stamping on different channels. All of the channels are fully programmable and each adjustment on any of the Eq's , Drive, Gain, Blend, Output individually is made easy with a flickering light meter that shows you visually as you turn the controls where your last setting was saved. It is very versatile with a massive range of sounds for both studio and live shows. I have used this on quite a few occasions in the studio where I did not put the bass through an amp, just straight into the sansamp , dial up a sound and press record and I have used it in many different Pubs/Clubs/Theatres/Festivals and have always been confident with the results. Due to the strong build quality I know having bought it once it will stay with me for a very long time to come