welcome to the forums!
akai did a bad job on this: new samples are always at the end of the list.
hit mode -> pad 6 (trim) and scroll all the way to the end of the list.
it would have been way more comfortable if new samples were added to the beginning of the list, but akai choose not to listen to user suggestions.
and it seems the mpc 2500 will not get any os update anymore, even if there are some bugs and annoyances left in the latest official release 1.24
they promised continuing updates and festure additions, but all this went to the mpc 1000 which got almost all features of the 2500 with os update 2.0 and the story with the promised updates to the mpc 5000 is not done yet.
peace, jo
what is a signature?