Note separate hand-out at adress https://www.researchgate.net/publication/317037200_The_notorious_cruxes_of_Common_Scandinavian_umlaut_and_breaking_A_metaphonic_feature-based_unified_solution // In the transition from Proto- to Old Scandinavian target vowels in an initial main stressed syllable were assimilated into triggering vowels in a following syllable by means of front umlaut, rounding umlaut and by certain forms of breaking, and this in a manner that they frequently ended up as new vowel phonemes. Some 200 years ago the rules of Germanic umlaut were framed and outlined by Rasmus Rask and Jakob Grimm. To date, some very fundamental problems remain unsolved, including the relative chronologies and the mechanism of transmission, as well as the question of how, or indeed whether, the genesis of new phonemes depended on the weakening of umlaut triggers or their deletion. Particularly in Scandinavian, the distribution of umlaut and breaking in the lexicon persistently defies a good explanation. In the presentation it is shown that by reconstructing one further preGermanic archaism and one chain shift in the Proto-Scandinavian vowel system, as well as a prominence system based on mora count, the most recalcitrant distribution of umlaut, namely when a trigger in a light syllable had followed a target in another light syllable, may be economically explained. Finnic loanwords do not by and large reflect sub-phonemic umlaut together with reflexes of an unreduced syllable structure. In the presentation three etymons which appear to originate from the umlaut era are discussed: *olut, *rohkeda and *kari.