Presonus Studio Channel, Preamplifier, Channelstrip, Class A preamp for tube microphones / instruments Tube Gain and Tube Drive, Variable VCA compressor (Threshold, Ratio, Attack, Release, Make-up gain, Auto, Soft), Three-band Parametric EQ, Analog VU meter, EQ Pre / Post compressor switch, 80 Hz high pass filter, 20 dB pad, Phase reversal, Type: 19