OMNITRONIC TRM-402 The Omnitronic TRM-402 is a professional DJ mixer with rotary controls and excellent sound features. A 4-channel version of the TRM-202 Mk2, the TRM-402 is equipped with high-quality components such as the ALPS (Blue Velvet RK27) rotary potentiometers, which are reliable and durable. It includes a built-in 3-band frequency isolator that manipulates the bass, mids, and highs for creative control. Each channel contains a gain control, a 2-band equalizer, and a line/phono switch. There is a 12-digit stereo LED level meter in the center of the mixer.