locating asound.conf file

HI, I've been trying to improve the sound in elementry Loki OS by following this tutorial
https://medium.com/@gamunu/enable-high-quality-audio-on-linux-6f16f3fe7e1f
but I cant seem to complete the last step as I'm unable to locate the asound.conf file. Any help would be be great. thanks

"Finally you have to configure the alsa to get the best audio output:"

$ vim /etc/asound.conf
The default configuration will be something similar to following:

# Use PulseAudio by default
pcm.!default {
type pulse
fallback "sysdefault"
hint {
show on
description "Default ALSA Output (currently PulseAudio Sound Server)"
}
}
Change it to this:

# Use PulseAudio plugin hw
pcm.!default {
type plug
slave.pcm hw
}