Hello, BY default IDL does not have the ability to do this. IDL can read WAV files (http://www.exelisvis.com/docs/READ_WAV.html), but not AIFF. If you want to read AIFF files into IDL, your best bet would be to use a utility to convert them to WAV files so you can read them into IDL. From some quick searching it looks like there are a number of things on the web to help convert your files, but one you may want to try using is ffmpeg. I mention that because IDL uses the ffmpeg library already and it is a free program to download. Here is even a stackoverflow forum post for how to convert files from AIFF to WAV with ffmpeg: http://stackoverflow.com/...in-php-and-viceversa I hope this helps! -Zach (VIS)