I ran across this, and wanted to share in case it helps anyone.
I needed to make a really long rising filter sweep, but the filter envelope was used for the attack, so it was time to use the LFO as an envelope (a common technique discussed up here).
However while trying all the modes I found something that might be less common. If you use fade you can get a nice linear ramp, which is very controllable for long fades, sweeps, etc.
Here are the settings, and sharing all of them to be thorough, but not all of these are necessary.
dest filt freq
Here’s a screen too: