As of SSL 360° v2.1.12, the Harrison 32Classic Channel Strip v2 plug-in is natively controllable from UC1. 32C differs from SSL channel strips, in that it has continuously variable Compressor and Gate/Expander Attack controls.
On UC1, you can hi-jack the RATIO control, and instead have it control the Compressor Attack time by pressing the FAST ATTACK button.
Similarly, you can hi-jack the RANGE control, and instead have it control the Gate/Expander Attack time by pressing the FAST ATTACK button.