Hi Garfield,
I've had a bit of a play with the sample modes, with my current rack setup there is some entertainment to be had with having a long sample set then triggering the ADSR to play snippets of the audio along with the other sequenced parts. I've got some old shortwave radio recordings, weather reports and the ubiquitous Moon-Landing samples, plenty of scope for fun. I need to dive into the sample playing abilities a bit deeper, the thing I note straight away is that the more samples you have loaded the harder it is to scroll through them with the limited range knob as its VERY fine adjustments.
I can get the SD card in with my fingers/finger nail but its never going to come out without tweezers :)
Enjoy your spare HP, don't rush to fill every last space, this is not like filling sticker books. Resist the urge to 'complete' your rack, its never complete so just relax.