Note: This is a copy paste from an old feature request going back to 2011 - here are some examples
Cubase 10 - Triplet/dotted grid snap in audio editor [Achieved] - #20 by currentsound - Cubase - Steinberg Forums
Cubase 9 - Triplet and dotted grid in editpr - #3 by carroz - Cubase - Steinberg Forums
Older Cubase Versions: Halion Sonic SE verschwunden - Auf Deutsch - Steinberg Forums
Older Nuendo Versions: Schnelligkeit der Midi-Spur ndern - Auf Deutsch - Steinberg Forums