"After installing the new OS and updating the sounds,I still see the old sounds appear when Iam in the pattern edit!!!."
Mike_E,
In terms of sound, there are no totally new sounds implimented with OS20 so you should not see any new sounds - even in Pattern Edit mode. OS20's FIRM0001.SND file 'adjusts' existing sounds and EQ settings for bass and percussion sounds. Hence, the current voices (names, appearance/format etc) will/should not change ~ just the voice content (quality) should be better.
Hope this helps!
AJ