I tried to download using my download manager igetter which intercepts file types and downloads them away from my browser, but it seems to download the php script and label them as .wavs .mpgs etc of about 20Kb, so I turned the interception off in igetter and it all worked.
Bit of a pain though.
to prevent people from mass-downloading and thus saving the poor server a bit there are a few scripts in between you and the download. So, yes, mass downloaders and download managers probably will not work.
sorry for that