Klark Teknik FX are part of his mixer.....
"QX1204USB
Premium 12-Input 2/2-Bus Mixer with XENYX Mic Preamps & Compressors, Klark Teknik Multi-FX Processor, Wireless Option and USB/Audio Interface
Behringer Xenyx QX1204USB Mixer with USB and Effects | Sweetwater
Needs to explain his problem in more detail.