Another trick to make up for the crudeness of that "bar-by-bar" shortcoming, is to fiddle with the number of measures per bar over the slow-down bars (set this inside the Bar Settings dialogue). The theory here is to chop down for example a 4-beat bar into four bars of one beat each, and set a gradually slower tempo on each of these. This can, however, be quite tricky to pull off with a realistic result... I myself have actually never done this crazy

Also mind the resolution option for any severe tempo changes (found in Realtrack Preferences). Sometimes if set too high, the jump from one tempo to the next will sound notably worse than otherwise, due to the added strain on the program/computer.

Just because you can, doesn't mean you should!
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BBox 2022 Audiophile, Mac Pro Intel, OSX 10.6.8, 800x600 (TV VGA)