You can put an Equalizer on the line and have it actually control all components hooked to the unit via tape monitor universally, and be able to turn it on and off the line. Also Tube buffers have become rather popular and affordable, this will take the signal and run it thru tubes and back out to your amplifiers, or even in a cheap integrated amp with tape in and out you can make the sound tubish by doing this for a second system or something.