Roland MC-808 Owner's Manual page 115

About the sample numbers chosen during
sampling
The samples created when you execute the sampling operation
are placed in an area where there are at least 256 consecutive
unused numbers in the sample patch.
* You cannot perform sampling if there are not at least 256
consecutive unused numbers in the sample patch. You will need
to delete unneeded samples (p. 99) in order to allocate 256 or
more consecutive free numbers.
About the volume when sampling
The volume of a phrase that you sample may be less than the
volume of the original phrase. If necessary, execute the
Normalize command to raise the volume.
Use the dedicated editor that's included to execute the
Normalize command.
Sampling procedure
115