Some Collections feature "Blurred" patches.
While we aim to only record the most pristine material, sometimes imperfections creep in where something is not quite right. Loose samples are samples that are not really clean (untidy attacks, pitches, etc.). Normally we throw away these samples when we separate the perfect sounding recordings from the dirty ones in the editing process.
On some chosen patches we decided to keep them and make them playable in addition to the clean ones. The special idea behind these samples is that when you play them on their own, they do not really sound like you could use them in a score - they are really dirty. But when you combine those not quite so clean samples with other instruments in creating a composition, you will see that these imperfections will breathe much more life into your mockups.