It's a really long story. I always make these stories long because I pretend I'm a great story teller!
But seriously, I have worked steadily with Chuck from the day we met in 1986. It just doesn't appear that way, because on some albums I was part of the preproduction process and didn't participate in the album recording. With me and Chuck there was no "join the band" or "quit the band" policies. We were above all friends, then musical collegues. So it doesn't appear that we did anything between ITP and Control Denied. But trust me, or ask the other guys that were there, I was involved with Symbolic and TSOP too. The reasons for appearing in that kind of "in-and-out" style is the long part of the story that I didn't think really mattered. It's actually a bit boring, that's why I just say that we did our own thing during these times. Which is about all it really is.
SDG