The Rupert Neve Designs Portico 5024 is a rackmounted 4-channel mic preamplifier based on the circuitry from the Portico 5012 module.  The 5024 sports a built in power supply for use with standard IEC cables, a variable high-pass filter, a mute control, and RND's "Silk" function for more harmonics. Channels 3 and 4 can be switched for Mid-Side decoding, with channel 3 controlling the Mid signal and channel 4 controlling the Side signal.