I usually only save the drum beats or percussion sounds because, even if they're full loops, I can somehow adjust and reuse them. However I haven't found any really good use for melodic loops other than maybe inspire some kind of vibe (which can be achieved as well by listening to commercial music). If I add a predefined chord progression, it's like I have to stick with it for a good part of the track. Any tips? I'd like to read how you work with Construction Kits.