Here is a quick video on how to add samples to the sample map in Loupe 2:
Sample Map Wrangling
First off - how to add new samples! Because I'm lazy, I discovered that the easiest way to add and map new samples is to put the first sample at the bottom of the map - position zero - and set its root key to zero. Here's how it should look:
Make sure you've clicked on the thin grey bar above the waveform display on the instrument panel in order to "focus" the sample editor on that sampler module.
There's also a way to do this graphically through drag and drop using the keyboard view. I've explained it here - the graphics are from Reaktor 5.15 but the technique is essentially the same.
You can also try this Reaktor map builder tool... it's perfect for building maps for the sample pack because it places one sample per note with the root set to zero. I tested it on Mac and it works great - it's Java based so it should work on Windows too.
Another map builder - this one created in the Ruby scripting language - is here.
One of my favorite sample sources is old vinyl. Some of the best raw material comes from old exotica, OST, easy listening and space age pop music, and also "library" or production music. The production on these old records can be astonishing. Some names to watch for are Egisto Macchi, Piero Piccioni, Esquivel, Arthur Lyman and Janko Nilovic. I suppose sampling this stuff is a legal grey area but in many cases the musicians are dead, the records out of print and the record companies long gone. Besides, if you're using the likes of Mirage you'll be transforming the samples beyond recognition anyways. (disclaimer: I am not a lawyer, proceed at your own risk)
For those of you who can't afford to jump on eBay and buy vinyl rarities unheard, you can get a taste from music blogs that post rare and out of print exotica, space age pop, production music, fusion, and OST type things:
Some Reaktor users are reporting a problem where mouse activity in the sample map editor window of a grain cloud sampler can cause a Reaktor crash. This unfortunately is a Reaktor 5.5 problem - I can produce the same crash by dragging samples in the sample map of the factory ensemble Grainstates.
It's not happening to everyone - see the thread here in the official Reaktor technical issues forum for more information. If you're experiencing problems, please post there to let NI know that this is an important bug fix for the upcoming Reaktor 5.6.
In the meantime, there are several workarounds. The easiest one is to turn off Reaktor's audio engine while loading or placing samples:
You can also use the map builder tool listed above to create and import sample maps.
Adding samples in the list view (that is, NOT the keyboard view) of the sample map editor also works for me, even with the audio engine on.