Make a copy of the new made layer and press on Alt button to erase the unnecessary things and set the black color.

The Opacity on the layer should be of 50%.

Now we should merge down in a group all the layers containing the button.
Then copy the new made group four times and make use of the Free Transform option to change the parameters, like it is demonstrated in the next image:

Take the following instrument and represent the PLAY symbol colored in black.