Unable to select certain attributes to follow tutorial
I've just started using Max and am following the tutorial projects. I am on "Explore time-stretching and compression", and it wants me to add several attributes to my sfplay object. But when I ctrl-click the input to add the attributes, some of them are disabled, I cannot select them. Here is a screenshot:
What is causing this and how can I resolve it?
I guess it is not really a headline top information in sfplay help file or reference, but you need to enable timestretching mode first, to be able to use time stretching and pitch shifting functions.