Using loops

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Hey all.

So far I'm having a good time using and getting to know LMMS. Just a question on using sample loops. I inserted a sample loop into the bass editor and changed the tempo, but the loop did not stretch to fit the drum pattern. I come from a background using Acid pro and a little REAPER, and was hoping that a timestretch feature was built in to the program. Am I doing something wrong here or does LMMS just not have this capability yet.
So far my workaround was to put the sample into acid pro, and render it out with the same tempo bpm as my LMMS project, then insert into LMMS.

Please help.

Thanks,

Omar
The Time Duration always remains the same even though you can change the Tempo!!!!