Through the context menu, you can initialize a sample kit in two ways;
"Init Kit" clears the master sample (audio) and clears all slices. Use this option if you wish to completely delete a kit. Note that any sample space occupied by the kit is not released until you leave the sampler. If you perform this operation to free up space first, then please leave and re-enter the sampler. This will kick-off the compaction and defragmentation process to reclaim the unused space.
The "Init Mstr" sub-option restores the master sample audio as one single, big slice; any audio for this kit - whether allocated to a slice or not - will be restored into that one big slice. This option can be useful as an 'undo' function, for example if an auto-slice of a drum loop master sample did not yield satisfactory results.
Note that "Init Mstr" will not work for kits with mixed-format slices (for example 44.1KHz 8-bit mu-law recorded slices and 22.05KHz 16-bit recorded slices). Note also that - like all slices - there is a 11.8s length limit. If this comes into play the function will report 'Warn big'.