The metronome is something that has been missing for some time. This is a work in progress release and there is no UI yet. I have created two possible metronome patterns: woodblock and metronome clicks and there is also a ballad type drum beat.
This is the screen shot for the proposed UI for the metronome.
the source file is called GuiMetronomeDialog.ui in the wip/metronome branch.
I could display the starting BPM of the pieces and have two linked input fields for the percentage speed or the PBM and changing one field changes the other field. The actually internal way of adjusting the speed should always be in percentage speed. See the post above for the reason why.
Also just for testing the the volume to the right of the hands is used to adjust the metronome volume but it is not working correctly yet.
My thought on the default metronome sounds would be to use the the wood block sounds but I am not happy with the first beat sound. I don't know if the metronome bell is better with the wood block?