I should work whether they be default or add-ons. It will not work in any other flightsim version other than P3D v4.
I have been looking for a helo callout for some time but couldn't find one.
This is not all my own work, l have just modified existing programs and put them together. Thanks to Stefan Liebe, Jimmy Foong and Bry Hardee whose 2011,727 callout add-on formed the basis for this program and to Doug Dawson for his dsd_p3d_xml_sound_x64.dll gauge.