Tonematch Mixers / Compressor
MikeZ-at-Bose talks about the Compressor settings in the T1 ToneMatch Audio Engine[1]
Light is about 2:1, fast attack and release.
Medium is about 3.5:1, fast attack and release.
Heavy is about 6:1, fast attack and release.
All have 'soft knee' transitions.
Hope this is helpful. When tuning the compressors I relied much more by ear to determine the settings than by numerical values.
A couple of comments on the settings.
When doing general compression like is done in the T1, I found fairly fast attack and release times to be the most versatile. Slower times need more fine tuning and are more prone to artifacts when used heavily.
The threshold is the most important control on any compressor, in my opinion. Careful adjustment of this is super important. You need to make sure you are compressing the parts of the instrument that you want to compress (peaks, 20% of the time, 100% of the time etc.)