I'm using Viewer 2.5 Beta 9. Proposing to give Viewer to choir members. Believe they would find play speed variation useful, e.g. to slow down fast passages during play.
When using the menu commands, Play Slower and Play Faster act immediately as implied by the command names. Play Speed pops up a box for the user to choose a % of, presumably, the specified song tempo. The % value displayed appears to be 100% if the play speed hasn't already been varied or the % representing the current speed if it has already been changed.
The behaviour of the short cut keys is inconsistent. Alt - (Play Slower) slows down in an identical manner to the menu command but Alt + (Play Faster) pops up the % dialogue box. Is the Alt + behaviour a bug?
To avoid confusing the users, I propose to tell them to: *** use the menu commands Play Slower and Play Faster only. To use the Play Speed command requires a deeper understanding of the interface which I wouldn't propose to burden them with; *** avoid the use of the short cut keys because of the inconsistenty between Alt - and Alt +.