Japanese audience do express their appreciation for a good performance and they also shout “Bravo” (“Buraboo” in Japanese) in standing ovation. However, they are quite shy and it is not often that they stand up in ovation. More often, you can hear them whispering among themselves about the good performance.
That’s when you hear phases (2) and (3) as above. Nevertheless, try saying “Buraboo” next time. Maybe that will encourage other people around you to stand up as well.