. . . . please be aware that there is a slight blockage in the plumbing system. Due to a build up of clay and earth in the pipe between the pond and the hole, this is causing a loss in water pressure which in turn means that water is not getting into the drip pipes. This results in a loss in drips and therefore volume and density of notes. i.e. the music is very quiet and sparse.
While waiting to implement a permanent fix for this, one solution for an intrepid visitor can be found in the post, b.y.o.b. below.