You’re talking about E? No, not really. If the cut is another drug, it’s usually a cheaper upper. That’s probably the vast majority of them.

Speedballing is up and down, and typically refers to simultaneous use of cocaine & heroin. It’s usually something addicts of one of those two get into when the one on its own isn’t doing much for them anymore. Or because they need one or the other to “sleep” or “wake up” after the other.