Florian, I reread what you said and now I understand it better.

So I want an a-165 to convert a gate into a trigger spike. Does the
A-165 convert both the GATE ON and GATE OFF signals into trigger
spikes So that's why I need an a-166 to make the A-165 only send out
a trigger spike on the GATE ON of the gate signal from my A-190 midi
interface