edit sounds in akai mpc 60 os v.3.10e

when I make a program with sounds (edited with sample values different than zero)
for ex.
sound 1 soft st 00(sec).000(msec).00 (samples) / soft end 01.500.39 / lenght 01.500.39
+ sound 2 soft st 00.000.00 / soft end 02.100.05 /lenght 02.100.05...

then I save it program + sounds... when I load it and I go in edit sample I find:

sound 1 soft st 00.000.00 soft end 01.500.00 AND NOT AS I SAVED SOFT END 01.500.39 (lenght remains 01.500.39) so to get the same value I edited before I must re-write soft end

+ sound 2 soft st 00.000.00 soft end 02.100.00 AND NOT AS I SAVED SOFT END 02.100.05 (lenght remains 02.100.05) so to get the same value I edited before I must re-write soft end