As with the Basic Metronome, you can accent or unaccent beats with RIGHT CLICK, skip beats with LEFT CLICK, adjust beat volumes with MIDDLE CLICK or SHIFT + LEFT CLICK. For details see the page about the Basic metronome.
You can also adjust individual beat times, or practice with a gradually changing tempo, or add a lilt to the bar timings. For more about this see the page about the Pro metronome.

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What it sounds like
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Here is what it sounds like: golden ratio / 4

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The golden ratio rhythm is the most polyrhythmic possible rhythm
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The golden ratio is as far as you can get from any simple fraction.
For a nice demo of this, see Nature golden ratio - a
nice demo of how the golden ratio is as far as you can get from any simple fraction, and how this explains the way sunflowers form using the golden ratio and fibonacci number related spirals
This makes this the "most polyrhythmic" rhythm you can play, in a sense. It's the polyrhythm that continues for longest without any of the beats getting particularly close to the bar beat (as with that sunflower animation).

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Golden ratio rhythm with its square and cube
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You can have up to sixteen rhythms played together. Here is what you get with the golden ratio, it's square and cube - so that the first and second, second and third, and third rhythm and bar beat are in the golden ratio:
Here is what it sounds like: golden ratio with g squared and g cubed / 4

When you show this rhythm in Bounce Metronome Pro, the second row may be shown reversed - that's because the bouncing balls in successive rows bounce in the opposite direction to make it easier to follow the distinct rhythms in a polyrhythm visually.
This is what it looks like with the middle row reversed - several of the beats seem to line up but that's just because of the reversed middle row:


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