Have been building some code triggering drums. In order to trigger the Kick so that it sounds long and full, it appears you have to have a LONG trigger, as long as the Kick is -- in other words, a gate. If the trigger is short, it truncates the Kick. This does not happen with DrumKit010, which really uses a trigger.
You can verify this by triggering with an LFO pulse of short pulsewidth, but note that triggering off of Triangle is too long even at minimum pulsewidth. But if you set it to Saw you may have more luck with very short triggers. See what happens.
This means I can't just send a short trigger to Kick -- I have to make the trigger long enough for it to sound, and it greatly complicates situations where two triggers are near each other (such as a very close swing).
It appears to be associated with the Kick pitch. Set the Decay and Drive high. If the pitch is high, a short trigger acts as a gate. If the pitch is low, the short trigger and long trigger act the same.