If your keyboards have XLR outputs then there should be no reason why you can't go straight into the XLR inputs of the console. If you want the 16 channel rack mixer, it has 12 Mic/Line combo jacks on the front and 4 XLR inputs on the back. Any of those should be able to handle XLR's directly from a keyboard or synth. If you want the 16 channel console, it has 8 Mic/Line Combo jacks and 8 XLR Jacks. Again, any of the 16 channels can accept XLR inputs from a keyboard. Only the Combo jacks will be able to accept 1/4" though. The jacks have smart detection for what kind of cable is plugged in and will adjust the preamp accordingly. XLR inputs have 60db of gain available. Line inputs have 20db of gain available.