Comment 3 for bug 1750783

https://github.com/mixxxdj/mixxx/pull/1541

I have opened a pull request fixing this issue. The metronome effect is now working as per the group features passed and it stops as soon as the beat_fraction stops increasing.

After this commit, the metronome will stop showing an arbitrary behavior when the effect rack is in MASTER mode. Since the passed master features do not have a beat fraction, it will not tick at all.

Maintaining a beat_fraction for the master track seems to be a solution to this and the bug mentioned in https://bugs.launchpad.net/mixxx/+bug/1738590

Please review