One reason my rack is out of mothballs is that I am manipulating more sounds concurrently than ever before. I have split my signal to accomodate the production of loops and drones along with my main parts. I am experimenting with an old Roland Line Mixer but am not convinced it has the best headroom or even is fully functional. Who can recommend a line mixer for me? Right now, 4 inputs is the minimum though I can see that expanding.