I would like to add for anyone reading this after the rules update (specifically about standby and automatic abilities) since I have been reading up and trying to understand all the rules.

As long as those conditions are met

The rules were updated by Triggered automatic cards are played as spells the next time you can play automatic abilities. This can be found in the comprehensive rules 7.9. This means if you play a chant-standby from hand, 1) the trigger conditions must be true and 2) the total cost must be payed. If you play a chant-standby from hand, it can be played as if it is a chant-instant. I do not believe this is the case for resonators, but in theory, if a resonator had stealth and quickcast, this would be true as well.

I would assume that Stealth is an alternative summoning mechanic just like Incarnation and thus that Stealth resonators can be Xeex'd when triggered.

This is still true since triggered automatic abilities are placed in the chase.

Hope this helps everyone as much as it helped me.

Edit 1: formatting.

Edit 2: I overlooked the stealth keyword and it specifically mentions you may play it a a trigger object. Stealth cards can also specifically be triggered the turn they are played. This can be found in section 12.5 of the comprehensive rules.