Gasp, you’re right. There is no threshold for Onsets on Bitwig. I guess I got mixed up with the discussion about Tempo follower, where Onsets and threshold are involved, but through the Replacer device, and in that case the thresold refers to dB.
But still, maybe that thresold on Studio One is also measured by the same criteria as the Replacer? In the end the goal for this feature request is to detect the beats of the audio to quantize them, and those beats probably can be found through dB threshold (wild guess, I’m not an audio expert).
In conclusion, the idea would be that this Audio Quantize could detect the points to quantize automatically through Onsets (good for discrete sounds like a kick or bass hits) or through dB thresold like the Replacer device does (better for more dense audio?).