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can't get ./fplay to work

i followed the instructions to install the loop http://www.sdrutah.org/info/rx_equipment.html
I did everything but launching ./fplay does not work.
Here's a mistake. Debian 11.1

root@websdr:/home/raketa/websdr/dist11# ./sdrplayalsa -r 768000 -f 3750000 | ./fplay -D plug:f_loop0_in -r 768000 -c 2 -f s16_le --disable-softvol -B 30000
ALSA lib pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM f_loop0_in
./fplay: main:765: audio open error: No such file or directory
   BWType value:  1536
   WBS value:  0 (0=off, 1=0n)
   AGC gain reduction step size:  1 dB (0=off, 1=0n)
   AGC gain increase step size:  1 dB (0=off, 1=0n)

aplay -l

root@websdr:/home/raketa/websdr/dist11# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC888 Analog [ALC888 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: ALC888 Digital [ALC888 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 8: fl0 [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 8: fl0 [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
card 16: lp0 [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 16: lp0 [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

I will try again and again until I succeed.

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