The Siobhan Sound Pack contains over 500 Sounds For Multicopters, Planes and more.
The zip (Click on Link Then Click on Download) contains all the files but you can pick individual files from the en and SYSTEM folders to suit your needs (Right Click,Save Link As..).
Just have a look at the file list above and choose the files you want.
The SSP.zip has all the files we have recorded.
The SSP_Small_Pack.zip has the same files as a default install of OpenTX.