I use Cocktail 4.4.1 in Leopard, mostly in Pilot mode, and it has always worked well for me. I anticipate no problems with the Snow Leopard version.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365