What is the fine-grained topic of the following text: As always, all the sounds in this library are 100% royalty free, and come as Wav, Rex2, Acid and Apple Loops downloads, ready formatted as sampler instruments for Ableton Sampler, NNXT, Halion, EXS24, Kontakt and MachFive. Only return the topic.
Royalty-free sound libraries and their formats