Right. Only some folders are listed in Preferences. Use a File Explorer to view the Cakewalk Content \ Platinum \ ... directory. You should see a folder labeled ProChannel*.* - not at my DAW, going from memory. That is the default location for SPlat PC Presets as far as I know.
You can save and load PC Presets from anywhere, but I don't think you can set that in Preferences. I guess that's why you get the Load / Save Preset options in the ProChannel (see the link below). I have a few versions of Sonar, so for example I have some PC Presets in the Cakewalk Content \ Sonar X3 \ ... folder. I could copy those to ...\ SPlat \ ... I guess and save a few clicks, but haven't.
http://www.cakewalk.com/D...elp=ProChannel.02.html