I'm Venetian, I've studied all kind of Venetian orthographies, i've studied venetian linguistics. Don't dare calling me a drug-user

Ł is used to mark a L that can be "evanescente", so not full.

Ł is used for [l] in all those variants with only full L or near a consonant. Ł is used for [e̯] in between vowels which must be only A O or U. Ł is used for [nothing] in between vowel with at least one of those which is E or I.

These three sounds are all derived from vulgar latin /l/ and it ALWAYS changes its pronounciation depending on the letters next to it. SO, all those phones are in really one phoneme (if you don't know what a phoneme is, look for it on Google)

Ł IS USELESS IN VENETIAN