Livemix seems to have the first part of that goal nailed down nicely, with an extensive feature set that gives performers precise control over their personal monitor mixes. Each mixer can control up to 24 input channels, with generous signal processing on each, including parametric equalization, high-pass filter and compression. A similar complement of processing graces each output, which also adds reverb.
Digital Audio Labs Livemix CS-Solo Personal Monitor Mixer
Digital Audio Labs Livemix offers yet another take on personal monitor mixing, one with the stated goal of being both feature-rich and user-friendly.