PreSonus Studio Channel Vacuum Tube Channel StripThe Studio Channel is great for studio and live use. Its Class A preamp features a high output 12AX7 tube and Gain and Tube Drive controls. The full featured, VCA based compressor includes Auto Attack Release. The EQ can be pre or post compressor and has a fully parametric mid band and semi parametric high and low bands that can be shelving or peak. Features: High voltage Class A 12AX7 vacuum tube mic instrument preamplifier Gain, Tube Drive, HP