Aah, Now I know what confused me. The question of fourths or fifths is really based on whether you know they key of the tune or the harp and from which direction you come. I.e. if I have a C harp how can I tell what the cross harp key is? Or, if the key of the tune is in G how can I tell what harp to use? My discussion in the past has always been from the former - the question of what is the cross harp key for a given harp. This is a fifht up or a fourht down. Others were correct in pointing out that the harp you should pick will thus be a fourth up or a fifth down from the key of the tune. To avoid this discussion all the time we should adopt the habit of saying "if the tune is in G" or "if the harp is in C" before we go further. I bet that this simple point that confused me often sparks alot of responses from others as well
