I'm not very technical but what does it show here:
Start/right click my computer/properties/hardware/device manager.
Scroll down to and open 'sounds video and game controllers'.
Double click on SoundMax and see what it says. ie'This device is working properly'. ( Or not).
Check that the bottom box shows 'use this device'
If it doesn't --use the dropdown there to enable.
Apart from the above that is the sum total of my knowledge!