I'm reading 'Learning Irish' by Micheál Ó Siadhail. Along with the usual things about broad and slender consonants, it says:
Quote:
As well as the double slender l and n [...] there is also a single slender l and n
and gives these examples:
Quote:
buille - buile
caill - cáil
cinneadh - cine
Spáinn - 'spáin
This is not my first textbook on Irish (and Cois Fhairrge dialect in particular), but it's the first time I've encountered these nuances, and I'm slightly confused by them.

In my native language (Russian) almost every consonant has its palatalised version, so I have no trouble distinguishing and pronouncing broad and slender consonants in Irish. The difference between
lá and
leáigh is very clear to me. But I can hardly hear any difference between
double slender and
single slender 'l'. 'N' is somewhat easier, but also quite difficult to catch. I have the audio recordings that go with the book, but they didn't help much in this case.
I know it's hard to actually describe a sound, but can someone please explain how the organs of speech should be positioned to produce the double slender 'l' and single slender 'l' sounds? Or, if someone could provide an audio of a person who pronounces these sounds clearly, that would be very helpful.
Thank you very much in advance.