Becky:"Regarding your last comment, I'd think that the bellows reversal would want to go with the beat emphasis, so more likely (depending on the "flavor" of the jig) would go on the first beat of the measure, even if there were pick-up notes in the phrase".


RE: I do agree with Dick if "the musical phrase" actually includes an "upbeat" or "pick-up note". Generally speaking about typical 6/8 straightforward jigs however with no such "pick-up notes" having just one reversal/bar ( and on 1st beat) I do not find naturally rhythmical in the best sense since that also means having every other bar beginning on pull and every other on push which is neither efficient nor in my view intuitively comfortable.

It is always more efficient with squeezebox-playing having the strong beat on pull but quite a few concertina players for some reasons do not practise that.
With Anglos it may come natural in one way having strong beat on push since the tonic and dominant(even when existing on pull) basically is on push and the keyboard is designed that way.With some unisonoric instrument like English or Duet this has no importance and there is no such argument against the routine with emphasis on pull.