FLStudio Signature Bundle, which includes a license for Fruity Soundfont Player. I believe I have registered FLStudio correctly; the "About" dialogue says "Registered to <my name>". Email address/password login failed, but copying ...
FL but also while playing back Youtube vids or mp3s. Ran a system benchmark and all my PC's parts perform as they should.
Not sure, but it seems like they only appear after using either FLStudio or Flash ...