Denis what type of sound are you sampling? There may be a possibility that the start point of the sound might be slightly differnt from the end where the sound peaks.. (hope that makes sense) It could quite possibly be the type of affect that the keyboard your're sampling from has applied to that sound... Try this.. Turn the effects off on your Cs1x for the sound your're sampling.. Also before you turn the effects off, check and see what effect the Cs1x has assigned to the sound, check the reverb, chorus, and whether there is a system or insert effect applied as well. Write these settings down too. then check the effects on your 9000 pro to see if there is a similiar effect (which there should be) Yamaha is pretty universal with effects in regards to their upperline synths. If you sample just the raw voice with no effects into the 9000 pro and edit the sound by setting your desired loop point, and then use the internal effects of the 9000 pro you should be able to get the sound you want with the proper looping.. Just find the effect or the one that's closest to it and match up the numbers. Just transfer the settings from the other keyboard into the 9000 pro manually. Hope this helps...

Squeak