Here is my study:
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baba@debian:~$ cat /proc/asound/cards
0 [M1010LT ]: ICE1712 - M Audio Delta 1010LT
M Audio Delta 1010LT at 0xbc00, irq 22
1 [Loopback ]: Loopback - Loopback
Loopback 1
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baba@debian:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: M1010LT [M Audio Delta 1010LT], device 0: ICE1712 multi [ICE1712 multi]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 1: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
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: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
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
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baba@debian:~$ jackd -d alsa
jackdmp 1.9.12
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2017 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
audio_reservation_init
Acquire audio card Audio0
creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit
Using ALSA driver ICE1712 running on card 0 - M Audio Delta 1010LT at 0xbc00, irq 22
ATTENTION: The playback device "hw:0" is already in use. Please stop the application using it and run JACK again
Released audio card Audio0
audio_reservation_finish
Cannot initialize driver
JackServer::Open failed with -1
Failed to open server
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baba@debian:~$ ps -aux |grep audio
baba 13363 0.0 0.0 7860 748 pts/5 S+ 19:51 0:00 grep audio
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baba@debian:~$ fuser /dev/snd/pcm*
baba@debian:~$
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baba@debian:~$ ps -aux |grep snd
root 309 0.1 0.0 0 0 ? S 16:53 0:19 [irq/22-snd_ice1]
baba 13367 0.0 0.0 7860 744 pts/5 S+ 19:51 0:00 grep snd
Otherwise, aplay works fine, and I also reinstalled jackd and jackd2 but the issue remains the same.
thanks in advance... Yannis Stathopoulos