This little thing is amazing. There are 6 different types of inputs on this device. 2 of them have pre-amps built in and allow you to use either an XLR input or a 1/4" (TRS) input. There are 2 other inputs that allow you to use 1/4" (TRS) inputs but not XLR and also do not have pre-amps. The other inputs are a MIDI input and a SPDF input (RCA connection). This is more inputs than I would ever need, however it is nice to be able to expand if I need to. This thing also feature dual headphone out ports with individual volume controls for each of them. This is great for collaborating with people on certain projects. I highly recommend this device.