Kramer 2 Port Mini Audio DSP-1 is a digital sound processor that enables the control of individual volume per input, 3-band parametric EQ, selectable HPF (high-pass filters) at 70Hz and master volume via IP. 2-Input Mixing with Master Volume. 3-Band Parametric Equalizer. Hi-Pass Filter. 32-bit Advanced Digital Analog Converter. Line-Level Amplifier. Web Page / RS-232 Control. Creates and Saves Presets.