Aspartame trumps Sucralose

Well, I got some packets of Splenda yesterday, and today tried adding it to Diet Dr Pepper. Not exactly successful. Yes, it tastes sweet now, and it turn out I can taste sucralose just fine. But I can also still taste the nasty not-sweet aspect of the aspartame in it. And the aftertaste of the dextrose and maltodextrin filler in the Splenda. So it's both sweet and nasty, with a bitter aftertaste. Drat. (And it's been a generally annoying afternoon in addition.)