IK Multimedia is having one of their "Group Buy" extravaganzas, where they heavily discount a product and then provide a free bonus when a certain number of folks participate in the "Group Buy" by purchasing at least one product, and this is what they are doing for T-RackS 3.5 Deluxe, which until February 29, 2012 is discounted by 60 percent, so instead of being the usual $499.99 (US), it now is $199.99 (US) . . .
[NOTE: If you already own an IK Multimedia product, for example Miroslav Philharmonik, then you can do a crossgrade purchase, which lowers the price to $99.99 (US) and maps to an 80 percent discount . . . ]
T-RackS 3.5 Deluxe "Group Buy" (IK Multimedia)
T-RackS 3.5 Deluxe is a set of mastering processor emulators in several formats, including VST plug-ins, and it typically is used either (a) in a set or "suite" where various signal processing components are connected in series or parallel and applied to the Master stereo output track or (b) as one or more individual components applied to an instrument or vocal track for a very specific purpose . . .
As a general rule, doing a lot of mastering work on orchestral and symphonic music tends to be antithetical, since it nearly always changes volume level dynamics, but some of the individual components of T-RackS 3.5 Deluxe are handy when a sampled instrument does not have a good overall volume level, which tends to be what happens for example with harps, and if you want to have a harp do a solo, then running it through the Vintage Tube Program Equalizer tends to be a helpful way to bring the harp to the front of a mix, since the Vintage Tube Program Equalizer is based on the Pultec® EQP-1A program equalizer, where in this context "program" refers to the content played by an FM radio station or whatever, and this particular component became an industry standard due to its melodic characteristics . . .

[NOTE: In the US, the FCC requires radio stations to follow very specific broadcasting standards with respect to signal strength and so forth, so to comply with the various FCC broadcasting standards, radio station engineers use signal processing equipment to ensure that everything is within required ranges and so forth, which for radio stations that broadcast orchestral and symphonic music was a bit of a problem, but the Pultec® EQP-1A provided a nice solution, since it does the work in a melodic way, which in fact is one of the ways that record producers used the Pultec® EQP-1A . . . ]
Pultec EQP-1A Manual -- PDF (426KB, approximately 7 pages)
Pultec@ EQP-1A Program Equalizer (DIY Pro Audio)
For nearly all the other genres, mastering software basically is mandatory, which certainly is the case for DISCO, Pop, Rock, Rhythm and Blues, Heavy Metal, Country Western, and so forth and so on . . .
And you can use T-RackS 3.5 Deluxe on the Master stereo output channel in the NOTION 3 Mixer, since it is a VST effect plug-in, but it also includes a standalone version, which is used to do mastering on the WAVE file that is exported from NOTION 3, where for orchestral and symphonic music there are gentle mastering suites, which are more subtle in the various things they do . . .
I use T-RackS 3.5 Deluxe with Digital Performer 7.24 (MOTU), which is the DAW application I use on the Mac for mixing and mastering, and I record the NOTION 3 generated audio as "soundbites" in Digital Performer 7.24 via ReWire, where Digital Performer 7.24 is the ReWire host controller and NOTION 3 is the ReWire slave, and at present my focus is on DISCO and Pop songs, so I use the Opto-Compressor to "pump" some of the instruments, which is one of the things it does . . .
So, if you have been contemplating the idea of getting mastering software for your digital music production system, but $500 (US) for T-RackS 3.5 was a budget breaker, then this might be a good time to make a smart purchase, since $200 (US)--or $100 (US) if you qualify for the crossgrade price--and the possibility of getting an add-on signal processor component is considerably more attractive than paying $500 (US) for T-RackS 3.5 Deluxe and another $100 (US) for the add-on signal processor . . .
And for reference, IK Multimedia does "Group Buy" extravaganzas every so often, and this is the smartest way to get their products if you are patient and like vast discounts, which is fabulous . . .
Fabulous!
