Pre/post setting for swapping input channels sent to the computer from pre-low cut, -EQ to post-EQ, post-fader DFX, our 32/40-bit high definition algorithm digital multi-effect processor with 100 programs plus tap delay and foot switch jacks Channel 17/18 routed to computer can be selected from Main mix, Group 1/2 and AUX 3/4 16 Mic/Line channels with inserts 3-band EQ with swept mid-range 75 Hz low-cut filter on each channel AUX 1 & 2 with Pre/Post switch Six AUX send mixing bus 8 extremely low noise mic preamps 4 stereo AUX returns, 3 with effect to monitor +48V phantom power on Mic channels Four true Subgroups with Main L and R routing switches Direct outputs for multi-track recording Control Room and Phones outputs with multi-input source matrix Mono out with variable low pass filter from 60 Hz to 160 Hz for subwoofer Dual-position I/O pod Built-in switching power supply with universal connector, 100-240 VAC, 50/60 Hz Rack-mounting kit included Compatible with Mac OSX and Windows XP, Vista & 7 Steinberg"s Cubase LE digital audio workstation software included The Helix Board 24 Universal is the newest addition to Phonic"s popular Helix Board series of digital recording interface Mixers. The Universal mixer features a FireWire and USB interface that can individually stream up to 18 independent channels of audio to the computer and return two tracks for monitoring, all at screaming fast transfer rates of up to 24-bit/96 kHz with near-zero latency. Pre/post switches on each input channel ensure users can adjust the outgoing USB/FireWire signal between a pre fader and post fader signal with the utmost of ease. There are 8 extremely low noise Mic preamps, each with phantom power, spread across six mono Mic/Line channels and four stereo Line channels. Additional features include 6 AUX send mixing bus (2 AUX sends with pre/post buttons), input and output solo, two true subgroups and a rack mounting kit.