Icon size for audio file insert on a PDF page.

Acrobate X V10.1.9 Windows 7.

I wish to insert an audio file on a pdf page. I select "multimedia", "sound". Get the window to select the file. Once selected I then find that I cannot size the icon that appears on the page (click to play). The two fields are grayed out. If I click "OK" it results in a very large "click to play" icon. I cannot resize the icon on the page..

Does this function require C++? Have been getting an error message on PC startup about something being in error. I click OK and all seems to be working ok.

Any ideas?

Thanks,

Joe