On Wed, May 12, 2010 at 2:52 PM, Niels Mayer <nielsmayer@gmail.com> wrote:
I'm writing to notify of success with the db60xg -- thanks Rui, for turning me on to this great $20.00 synth!! Only remaining mystery is how to get qjackctl to open both the analog (hw:6,0) and digital (hw:6,1) parts of the Dynex dx-sc51 so I can have independent headpone monitors and SPDIF->main monitor.... 

Solved!!

Taking a clue from a different thread with a soundcard that costs 100x more and has 26 more channels... :-) . ( http://old.nabble.com/Is-it-possible-to-use-two-RME-cards-in-sync--to28513035.html ) I now won't need to buy another soundcard for my intended portable music computer as I can output to the "mains" over SPDIF, and monitor separately in headphones, all with a $5.00 soundcard!  I'll save my money for later and get a decent quality external TOSlink->analog, which is all I'll need to drive the "mains" without fear of computer noise or ground-loops, which is IMHO the right way to get sound out of a computer driving a PA....

In qjackctl: Setup..->Settings: Interface: hw:ICE1724 ; Input: (default) ; Output:: multi" 
giving ~/.jackdrc:
/usr/bin/jackd -dalsa -dhw:ICE1724 -r48000 -p128 -n2 -D -Pmulti -Xseq -zs -H -M

In Jackd, this gives me two working inputs, and four separate outputs -- a stereo analog pair that I intend to use as headphone/cue monitor, and a separate SPDIF/Toslink digital output.  

The trick is the output "multi" is defined as ALSA "type multi" (see http://nielsmayer.com/npm-dynex-asoundrc.txt ) as:

pcm.analog-hw {
  type hw
  card 6
}

ctl.analog-hw {
  type hw
  card 6
}

pcm.digital-hw {
  type hw
  card 6
  device 1
}

ctl.digital-hw {
  type hw
  card 6
}

pcm.multi {
  type multi
  slaves.a.pcm "analog-hw"
  slaves.a.channels 2
  slaves.b.pcm "digital-hw"
  slaves.b.channels 2
  bindings.0.slave a
  bindings.0.channel 0
  bindings.1.slave a
  bindings.1.channel 1
  bindings.2.slave b
  bindings.2.channel 0
  bindings.3.slave b
  bindings.3.channel 1
}

ctl.multi {
  type hw
  card 6
}

-- Niels
http://nielsmayer.com