I was doing some reading earlier about Irish in Kilkenny when I saw that the slender r was pronounced as /Ê’Ê²/ more similar to the s in measure and j in French. Listening to a clip of Seán Ó hÉinirí (https://www.youtube.com/watch?v=UP4nXlKJx_4&t=5s) I thought I heard him make a similar sound at 1:47 and again at 2:14.
Has anybody else noticed this or is it just O hEiniri’s idiolect? Has anything ever been written about this change before?
Edit: It would appear the sound is like a voiced retroflex fricative similar to the voice retroflex approximant