The X1622USB features four XENYX-fueled mic inputs with channel Inserts "one knob" compressors and 3 band British style EQs with a sweepable semi-parametric mid frequency band. The four stereo line level channels offer enhanced fine-tuning via 4-band EQ which is extremely handy for adjusting critical keyboard midrange frequencies. Aux 1 Sends are switchable (pre- or post-fader) and individual channels can be assigned to two subgroups for mixing flexibility.