Voice Metronome - Multilingual

There is no sound unfortunately.

It seems to bounce the little red ball to the proper beat, but it doesn't make any noise. A silent metronome - how do you rate it?

I've wanted to build an app like this for many years but never did because I discovered years ago that someone held a patent for this (no idea if it would hold up in court though) so I was pleased that an app finally became available. However, it needs a lot of work. 1) when I started it for the first time, the second beat was slightly early (or the first beat was slightly late!) 2) when I tried using subbeats,it didn't always work and when it did, to my ear the intervals were not perfectly spaced so the timing engine is not working well. This makes it not usable for me.