The dpFX Stereo Effects Mixer is a parallel mixer designed for stereo pedals & pedalboards and is also compatible with line level signals. It can be used as a summing box that can take up to 3 stereo signals and combine them into a single stereo output. It features high-impedance TRS inputs (buffered with JFET op amps) that can be driven by instruments (guitar, bass etc) or line level signals as well. It makes use of low distortion, low noise op amps and each input has a volume knob that goes from mute, up to +6dB gain. The output impedance is very low ensuring the best interconnectivity with the rest of your gear.