I had a play around and believe I’ve got it sorted!
The first thing you’ll need to do is change the recording preferences in logic to make sure that ‘Auto Demix by Channel if multitrack Recording’ is set to off
You can find this by going to Preferences -> Recording and select Recording Project Settings
Then make sure the box is not ticked
Once this is done, MIDI map the parameter you want to control to a dial in Dubler the usual way. You can now show the automation lanes by selecting the automation button at the top
On the track you want to write the automation on, make sure it is not armed. So make sure the R is not red at all. Also you can select the automation mode you want to use to record, so I’ve selected Touch here. (You can read what the different automation modes mean here: https://support.apple.com/en-gb/guide/logicpro/lgcpb1a6c15d/mac)
Once this is done, you don’t need to hit record in logic. You can simply play back the track and then use your vowels to input the automation data. You can then see the automation you input in the track and adjust as you like
Important to note if you hit record it will automatically arm the track you have selected and so will record notes. I’m no logic wizard, so this is just one way I found to do it. But let me know if that works for you!