Hello, thank you very much for the info. I now how to set up it, but I still can't do it and I don't know what I'm doing wrong.

I get the device recognized in some programs like audacity, but I still don't get it recognized in JACK.

If someone can help with this, thank you very much.

This is the .asoundrc file I'm using:

#pcm_slave.fasttrackpro_s {
# pcm fasttrackpro_48
#}
pcm.fasttrackpro_0 {
 type hw
 card 0
 device 0
}
ctl.fasttrackpro_0 {
 type hw
 card 0
 device 0
}
pcm.fasttrackpro_1 {
 type hw
 card 0
 device 1
}
ctl.fasttrackpro_1 {
 type hw
 card 0
 device 1
}
ctl.fasttrackpro {
 type hw
 card 0
}
pcm.fasttrackpro {
 type multi;
 slaves.a.pcm "hw:0,0";
 slaves.a.channels 2;
 slaves.b.pcm "hw:0,1";
 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;

}

pcm.ftpusb {
  type route;
  slave.pcm "fasttrackpro";
  slave.channels 4;
  ttable.0.0 1;
  ttable.1.1 1;
  ttable.2.2 1;
  ttable.3.3 1;
}

ctl.ftpusb {
  type hw;
  card 0;
}