Jack (plugin)

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In short, you can set up your asoundrc file to specify JACK as the output, like so: 

pcm.!default {
    type plug
    slave { pcm "jack" }
}

pcm.jack {
    type jack
    playback_ports {
        0 alsa_pcm:playback_1
        1 alsa_pcm:playback_2
    }
    capture_ports {
        0 alsa_pcm:capture_1
        1 alsa_pcm:capture_2
    }
}

ctl.mixer0 {
    type hw
    card 0
}

Then, after starting jackd with the appropriate sample rate for what you're doing, you can use ALSA apps with JACK: 

  jackd -d alsa -d hw:0 -r 44100
  aplay -D pcm.jack <filename>

This will direct the ALSA playback stream (from aplay) visible to your JACK application, rather than sending it directly to the sound card.

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