Just thought I would drop this here since it's been mentioned recently.
You can snap an effects rate to a certain time division by doing the following:
1. Set an LFO in any machine to be the desired rate.
2. Go to the pattern sequencer and go to automation mode.
3. Copy the automated rate of the LFO.
4. Set the effect rate to automate in song mode.
5. Paste the automation key at the desired time in the song sequencer.
6. Repeat this process for any rate changes you need.