Translation:We will come
If you look under the 'Popular' discussions, there is a sticky called 'Pronunciation / Ynganu' which has a link to some very good videos on Youtube. One of those videos specifically covers the pairs of vowels, including ow.
It is pretty close to the 'ow-' in the standard British English 'owning'. Watch the series of videos, though.
Thanks, both. Elsewhere in the course (in the "Colours" unit, "brown" (Welsh) is very much not pronounced like its English equivalent, but rather to rhyme with "loan" or "own", which is also borne out by the YouTube video. Hence my contention that the 1st person plural, future tense of "dod" should also rhyme with these words, not with "frown".