A welcome addition to our sound booth
The MX 400 is a great addition to any sound system. We were a bit disappointed, though, to find that the unit had dual stereo as the only option in which all 4 vocal inputs would work somewhat separately and effectively with our system. Our original intention and desire was (in our case), to have 4 separate monaural outputs, but the unit does not have that option. Had we known that beforehand, we would have looked for other units in your catalog that might have clearly provided that choice. The new and added dimension to the final product, however, is wonderful and quite versatile.