sidechain compression is a staple of modern production, both as a subtle mixing technique & as a powerful ducking effect. but how to make a preset to use sjidechaining without much set up? well david, as I'm sure you're aware, you can save the sidechain toggle into a preset but there's no way to save the source to trigger the effect. so I've thought of some workarounds that might help you -

one solution is to use auto pan to "fake it":