Mycroft and Squeezelite

First: Thanks to all you people allowing me to have such a great music experience in my home based on Free Software! So flawless that I never needed to register in this forum - but now I am puzzled...

I have been running a multi-room system (mostly Rasp3b with USB-Soundcard and speaker) merged with my OpenHAB - and I really like it. So the next step for me is to integrate proper VoiceAI into this and with Mycroft.ai there is a project I like. So, my plan is to simply add microphones to the existing RasPis + speaker and run mycroft + squeezelite on them.

Technically I thought it might be wise to first install mycroft using the PiCroft image on the RasPi, apt-get install squeezelite and be done. But: No matter how I try to specify the squeezelite -o - while running squeezelite (which works fine) I cannot get Mycroft to talk to me. Once I kill squeezelite again, some stacked messages from Mycroft come through. I have read a bit about problems with dmix on RasPi, but to be honest I am technically quite a noob and don't really understand what the problem is... It looks like Mycroft listens, but cannot speak while squeezelite is running.

I am thankful for any help to solve this!