I read this as if you have made an instrument-preset from a audio-file, and now you like to save thatwhatiguana wrote: I am probably being really clueless here, but once I have loaded a short WAV file into the AudioFileProcessor, now what do I do? I was presuming that I could save it into "My samples" but I do not see how I can do so.
Is that correct?
See this

all lmms Instrument-ui's has this basic top panel:
VOL PAN PITCH FX -and the the button that you use to save as a new preset !
That is the button you use, and you should save the preset in AFP-preset-folder.