Hi, after a few prototypes I have pushed my (first) final version of an extended metronome plugin to Gerrit:
http://gerrit.rockbox.org/r/#/c/887/ Testing and eventually merging of that into rockbox proper would be welcome. This replaces the existing metronome plugin now, as all the functionality is there. PS: Gerrit items 1100 to 1116 are junk caused by me not squashing commits before pushing ... they can be ignored and I would abandon them if I could remember where my OpenID thingy for Gerrit came from.