Hi, i certainly didn't understand how to do it or maybe it doesn't work in my case.
Instead of using a midi keyboard to play a VST I do it using the midi signal coming from a midi guitar and everything it has always worked but with a little excessive latency. I now describe what I do: in the Cakewalk menu, as a midi device, I activated the midi guitar driver and deactivated the ASIO4ALL input and output drivers, activating the midi device in the Cakewalk track input, but not only I don't hear the backing track but I don't even hear sound of the VST, everything is silent.