The function of the first three of these should be obvious, but Optical sets the Attack, Release and Ratio values to a preset level (ratio to 10:1, the attack to 10 and the release to 0) which is intended to be a starting point for an optical-style response. I found the threshold varies with the Ratio, Attack and Release settings, but generally in the -18 dBFS to -25 dBFS range.Ī 16-LED gain-reduction meter at the top shows how much the signal peaks are being reduced, and in addition to Attack, Release and Output level, there is an Optical button. Like the original, there is no threshold control – the Comprexxor unit has a “fixed” internal threshold level and an input gain control, and driving the input harder and/or turning up the input gain increases the amount the amount of compression which is applied. The Comprexxor is based on a VCA soft-knee design that had a few twists, including tube and tape distortion emulations (via 2nd and 3rd harmonic distortion). Whereas the original hardware was packaged in a full rack width 1U-high box, the Comprexxor, as you can see, is 2 U-high! All kidding aside, the format is very clean and convenient for on-screen use, and includes all the original features with enhanced functions and additional capability. The Comprexxor is a software emulation of a monophonic hardware compressor/saturator, enhanced to process stereo and mid-sides signals, with ganged or separate controls.
The Comprexxor, just added to the latest T-TackS 5 update, is unusual in that it’s a software emulation of a hardware compressor introduced in the late 90’s, a unit that itself emulated the classic compressor sounds of the 50's to 70's! So it’s an emulation of an emulation! And it adds a number of very fine features to the original design. In fact, T-RackS already had over a dozen models, but every compressor model brings something different to the table.
I’m not hurting for compressors, and as many readers no doubt have, I have dozens, including a couple hardware units and piles of software emulations.
Comprexxor for T-RackS 5 by IK Multimedia
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