Wait a second… what you want is pitch shifting, you’ll have to use a VST effect for that.
When you beatsync a sample the only way to change the pitch is to either change the beatsync lines or the song speed. Because pitch is nothing but the speed at which the sample is played, and when that is synced to the song speed the notes don’t really have any meaning anymore.
Basically when you sync a sample (presumably a loop), you fix it’s pitch(=playback speed) so that the total duration of the sample fits the specified number of steps.
Pitch is changed by playing the sample faster or slower, and my guess is that you want to time-stretch the sample, in other words, to change it’s pitch, but preserve it’s tempo. AFAIK, this is only possible within renoise except through a specialized VST plugin.