Cubase 5 sound card compatibility

Hi,i have Cubase 5 and my sound card is Tascam US-122M,and i want to know if it is compatible with Cubase because when i try to record vocals,the Audio track records the music that plays for some reason…(there are no speakers or any device to record sound externally apart from headphones)…any solution about the compatibility or the reason why this is happening?

I have a US-122L (and a US-144), but I can’t find your model on the net. Perhaps you mean a US-122 Mk2?

You say you are trying to record vocals, but then say that
…(there are no speakers or any device to record sound externally apart from headphones)…
so I’m a little confused by your question.

But try moving the Mon Mix control fully to input before recording - I’ve found strange effects with Win8 if this control is not set fully to input.