Create a tangent between a selected key and the adjacent keys on both sides, which can then use be used to manipulate the curve between keys.
Tangents are created on all translation curves (x, y, and z) for the selected key even when the key is selected on only one curve.
// In this example 3 objects are selected, then a range
// within the playRange, then a subset of the object's properties,
// then selecting the range of keys falling within the
// indicated range on the indicated properties.
// Finally tangents are created on the selected keys.
selectRange 200 240;