Hi RickeG,
The function that I used was from the edit menu:

Edit->Expand (Duration of Chords By Two)

This doubles the duration of each chord (i.e. it spreads the chord changes for each chord across two chords) and it also doubles the tempo of the song. (Which means that the total song duration should stay the same).

I am not sure what the original purpose of this feature was but I was hoping to use it to be able to effectively get 8 beats to the bar rather than 4 (useful if you have more than 4 chord changes to a bar or if you want to play several shots in close succession).

This wouldn't have worked too well previously with Realtracks because doubling their tempo would take them outside their playable range and this would introduce unpleasant stretching artifacts. In BIAB 2010, however, PG introduced a feature whereby if realtracks get stretched to a tempo that is more than double their recommended tempo then they will automatically switch to playing at half time. (I guess that the reverse is also true - if they get switched to less than half their recommended tempo they will switch to playing at double time).

Unfortunately it seems that Realdrums can't do the same trick (unless anyone knows otherwise?).

What I have been doing with the expanded chords seems to leave the realtracks playing at pretty much in their comfort zone (double tempo seems to cancel out half time and they sound pretty much as they did before I expanded the chords except that now I effectively have 8 beats to the bar).

I think that what YOU want to do, however, is leave the chords unexpanded but set the tempo to double that recommended for the reatracks. Instead of playing twice as fast (and sounding bad) the realtrack will automatically play at half time. It will technically 'fit' the new tempo but as Mac pointed out some of the playing may sound a bit odd for the higher tempo. Also, if all the tracks in the song are playing at half time then you may as well halve the tempo and have them playing full time. What I mean here is that the feature will probably be less useful if the entire style uses instruments that are running at half the tempo you want. It will be more useful if you have a style at a certain tempo and you want to add a real instrument which is only available at a much slower or a much faster tempo.

Also, as stated above, this won't work for Realdrums. This may not be a problem for you, however, as Realdrums tend to work fine over a much wider tempo range anyway .

I think that it may be a useful feature for your purposes but some realtracks are likely to be much more versatile at double/half speed than others. It will also depend upon what kind of realstyles you are adding them to - guess it will take a bit of trial and error to see which ones fit.

I hope that this is of some help.

Regards, Aubrey

If I hadn't seen such riches I could live with being poor.