I have recently purchased a Denon MC 4000 and its a wonderful controller for what I do. However, its been 2 months now and the right-hand deck’s Play/Pause button starts to show issues. It doesn’t play or pause the track when pressed. you need to put some considerate amount if pressure on the button in order to activate the desired action. I sent it to Denon since the item is in warranty, however, I would like to suggest an improvisation.
The play/pause button including the Cue is the most pressed buttons on the controller and I feel must be built robustly, similarly to that of its bigger siblings MC 7000 & MCX 8000 which have different transport buttons. The plastic or metal buttons like that on the competitive controllers is something you should consider.
The MC 4000 is the best controller in its class and there is no controller on the market that offers the features this controller offers for the price. So I would suggest you work on improving the buttons on the MC 4000 and add transport keys like that on the MC 7000 - MCX 8000.
Looking forward to seeing some improvement. Thank You.