I need some help with my bands backtrack setup.

We are currently using a steinberg soundcard to our laptop, wich feeds the left signal to the PA and the right signal to our drummers in ears.

The problem is that it gets messy for the drummer with an mono signal at the needed volume.

We tried to use the laptops headphones out for the drummer, and the soundcard out for the pa, but then we have to use some custom ASIO driver (like ASIO4ALL), and they tend to be unstable and stops working all the time.

So I was thinking either if there is a good ASIO driver for this, or if there are some cheap soundcard/USB mixer with 4 output channels.