[johnS]

On the mundane side, I'd like a simple gain controller that prevents clipping. All it would do is sit there, as the last plug on each channel, and limit the signal just before it hit 0dBfs. If it included a subtle "tape saturation" vibe that would be cool.

On the fun side, I'd like a universal side-chain plug that would follow the signal from one track, and use it to control a parameter of your choosing in a plug on another track. It would probabaly need to have some sort of ratio control so you could flatten out the dynamics for more subtle modulation if you wanted it, and it would need an overall output so you could set the range. (It would be cool to have a polarity switch, too.) This plug would have all sorts of really cool applications, and would turn your DAW into something akin to those old modular synths that could use audio signals as control voltages. Imagine having any part of your mix able to modulate any effect parameter on any other part of your mix. Groovy.

OK kids, let's hear it. What would you like to see a plug-in do?