Following discussion elsewhere, it has become apparent that Poweramp cannot perform what I perceive to be a logical function. That is to select an artist & play all albums by the artist but maintaining the track order of the albums. Currently the options are:
Play by track no. - This plays all the track #1s followed by all the track #2s.
Play by album - Track numbering is disregarded & tracks are instead played alphabetically.
There is an "almost" workaround but that then