I tired it just an hour or so ago and see what you mean. It' doesn't work very well however I did get it to work using the Remote's mike. The test track I used has a perfect dcs signal , I was able to record a short message and play it back. I think you're doing everything correctly but suspect your remotes mike button is sticking on. That pretty well locks up the whole works.
I don't have a external mike to try it... hopefully it will work better than the remotes mike.