Mixbusâ„¢ is a virtual "analog console" integrated into a full-featured Digital Audio Workstation (DAW).  Mixbus "True Analog Mixing"â„¢ provides critical mixing functions in a knob-per-function interface.  "True Analog Mixing"â„¢ is based on Harrison's renowned 32-Series and MR-Series console designs, plus Harrison's proprietary digital mixing technology.  Mixbusâ„¢ enables you to record, edit, and mix a musical performance in-the-box while getting a sound that harkens back to the golden age of album recordings.

Traditional DAW mixers were designed by companies with no pedigree in music mixing, and they suffer from well-known flaws. Harrison eliminated these flaws in Mixbus by completely replacing the DAW's internal mixing engine and applying proprietary True Analog processing. Harrison consoles are known for their great-sounding EQ, filters, dynamics, and bus summing on every track. Now Mixbus offers every engineer a real Harrison music console "in the box". With Mixbus's logical knob-per-function interface, the user works with the fluidity of a traditional analog recording studio while retaining the convenience of a DAW. Mixbus enables the user to record, edit, and mix a musical performance "in the box" but get a sound that harkens back to the golden age of album recordings. 

Mixbus Features: 

    * Straightforward “knob per function” mixer layout based on Harrison's renowned 32-series and MR-series music consoles.
    * Precision DSP algorithms for EQ, Filter, Compression, Analog Tape Saturation, and Summing based on Harrison's world-renowned large format analog and digital mixing consoles.
    * Unlimited stereo or mono input channels (based on available CPU power) featuring High-pass Filter, EQ, Compression, and 4 Mix Bus sends on every channel.
    * 4 Stereo Mix Buses (can be used for groups or auxes) featuring Tone controls, Compression, Sidechaining, and Analog Tape Saturation.
    * Stereo Master Bus that features Tone controls, Analog Tape Saturation, K-meter, and Limiting to help you make polished mixes.
    * Plugin delay compensation to support effects such as parallel compression.
    * Comprehensive "at-a-glance" metering with peak, peak hold, and compressor gain reduction visible on every track and bus.
    * Extensive DAW features via the Ardour Digital Audio Workstation.
    * Supports AudioUnit plugins and any CoreAudio interface.

System Requirements:
Intel or PPC Mac Running OS X 10.4*, 10.5, or 10.6.
2 or more cores. 1Gig+ RAM recommended.
A 3-button mouse with scrollwheel is required.
100 MB available hard disk space.

* on OS X 10.4, system must be fully updated to 10.4.11

You need Jack in order to work with the program
http://jackaudio.org/

If you want to rewire it use Soundflower
http://cycling74.com/products/soundflower