Anyone here have perhaps some more hints to get alsa route its output
to jackd?
    

Yes, you use pulseaudio, which can exit through JACK. The ALSA JACK
plugin has a very bad reputation and has never really worked great. 

Pulseaudio will then show up as a JACK client so all your ALSA apps will
transmit to pulseaudio, which then exits in JACK land.
  
Well.  I tried three different configurations cited in various places on the WWW; nothing worked.  Can you recommend a nonvague step-by-step? 

J.E.B.