Tube-Tech CL 1B is one of those units that has a defined personality while still being useful on a variety of sound sources in a variety of situations. It can be used for a calm and natural dynamic control, but depending on your settings, it can bring out punch and life from any material. Because of its way of treating the signal differently depending on the frequency content, it gets a lot of love when used on material with a wide frequency range, such as an electric bass that both needs low end control and a snappy presence, or an acoustic guitar that needs to be large sounding and close to the listener. And sometimes, the opto character is just what the doctor ordered for a full mix.