How to listen to Music and something else from the same Mac?

[climbwave]

Hi All,

Let's say I'm listening Music and the same time my friends call me on FaceTime. I do not want music to stop playing. I want Music to lower volume and increase volume on FaceTime.



I found something like this on Windows: http://degathsducker.weebly.com/ .



My question is: Is there any alternative for OSX?



Thank you in advance for your replay and help,
c