Hi, I own a Layla24 [1] soundcard and an ada8000 [2] digital converter, they are linked with an optical cable (and a bnc for wc). Using echomixer I can see VU meters rising on digital inputs. Anyway, when I start jack I can use only the eight analog inputs. I start jackd with "jackd -d alsa -d hw:1 -r 44100" jackd version is jackdmp 1.9.8 Here is my "aplay -l": **** List of PLAYBACK Hardware Devices **** card 0: Layla20 [Layla20], device 0: Analog PCM [Layla20] Subdevices: 10/10 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 Subdevice #4: subdevice #4 Subdevice #5: subdevice #5 Subdevice #6: subdevice #6 Subdevice #7: subdevice #7 Subdevice #8: subdevice #8 Subdevice #9: subdevice #9 card 0: Layla20 [Layla20], device 1: Digital PCM [Layla20] Subdevices: 2/2 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 card 1: Layla24 [Layla24], device 0: Analog PCM [Layla24] Subdevices: 8/8 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 Subdevice #4: subdevice #4 Subdevice #5: subdevice #5 Subdevice #6: subdevice #6 Subdevice #7: subdevice #7 card 1: Layla24 [Layla24], device 1: Digital PCM [Layla24] Subdevices: 8/8 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 Subdevice #4: subdevice #4 Subdevice #5: subdevice #5 Subdevice #6: subdevice #6 Subdevice #7: subdevice #7 [1] http://www.echoaudio.com/Products/Discontinued/Layla24/index.php [2] http://www.behringer.com/en/Products/ADA8000.aspx