I am now in possession of a Normal Sounding Bicycle Bell. I didn't actually do this on purpose; it just came with my folding bike, for which I have exchanged my old bike because it enables me to do logistically complicated and stressful but overall excellent things involving trains.
Recently I rang the Normal Sounding Bicycle Bell on the cycle path when there were two people walking on it in front of me, next to each other, naturally taking up about three quarters of the available space because that's the size people are relative to the cycle path. I rang it quite a lot. The people did not make any reaction. So I very carefully passed them in the tiny amount of remaining space. They still didn't move out of the way, but one of them remarked to me, quite amiably, "Oh, I thought I heard a bicycle bell!" as I went by.
I travelled a further 50 metres or so, processing this interaction, and then muttered under my breath, "So if you thought you heard a bell, why didn't you look round to see where it was coming from?" or something. I mean, how are these people still walking around unscathed? Surely some noticed-but-ignored danger should have, like, got them by now.