episode 111: The Mount Collins Reel (The Girls of Farranfore)
Here's a reel which you can hear Denis Murphy playing at: Mount Collins Reel / Doon Reel. There are special wobbles in the second tune which, according to the info at archive.org, are due to a hole being 'punched slightly off-center'. I'd imagine that could cause a wobble or two right enough.
Here are some notes: https://thesession.org/tunes/4026