Send me an audio file

Here you can send me any audio file (no size limit) which you think it does not compress well with OptimFROG compared to other lossless audio compression programs, illustrates a problem of any kind, or you just believe it would be interesting for me to test. You must enter a real e-mail address, so that I can contact you back, and also write a small explanatory text about the file you are sending. Thank you for your time and for helping to improve OptimFROG!