Look at the Knee knob. Most people leave it at 0 (Hard Knee). But if you dial in a Soft Knee (around 5-10dB), the compressor starts working before the signal hits the threshold.
High-end analog compressors cost thousands of dollars to add 1-2dB of "glue." The does this for free. Set Ratio: 1.5:1, Threshold: -3dB gain reduction, Attack: 10ms, Release: 400ms, RMS: 100%. The result is a lifted RMS level with zero harmonic distortion. Perfect for acoustic jazz, classical, or any mix where you want to preserve transient clarity. logic platinum digital compressor
Expect the Platinum Digital to remain in Logic for the next decade, quietly living in the Legacy folder, waiting for smart engineers to rediscover it. Look at the Knee knob