You know when a track cuts, and all the delays and flanges are left ringing out to end it off? That's what I'm looking for. I can manage to do it with Redrum, but I'm running a few Thor---->Scream---->Matrix----->EQ/Reverb, and I can't seem to figure it out for those.

Any ideas?

I think I know what you mean and I wouldn't even bother trying to do this in Reason. I did something close if not what you are talking about using Audacity. I'm pretty sure I just used an echo. Of course, this will only work if you just have the drums playing at the moment unless you want everything to echo/fade. Anyway I'd suggest fiddling around with Audacity. Here's the link to the song that I sort of did what you are talking about.

Solstice - Let's Party

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You can stick the FX module between the main controller and the main mixer out, and control the ON/OFF with automation. So just before the end of the track (last second) toggle ON with automation.