"R2004 FX- R Series with Digital Effects","The R2004FX offers 8 mono, balanced mic\/line input channels with with 3 Band equalization and a semi- parametric mid range control plus 3 Band equalization on each of the four stereo input channels. The R2004FX also provides 8 TRS ¼\" channel Insert jacks for the mono channels which allow the connection of external serial signal processing devices."