src_aurelia-bodylight-plugin/src/elements/sound-on-increase.html
<template>
<span if.bind="showdialog">
<i class="fa fa-bell" show.bind="soundon" click.delegate="switchsound()" title="click to mute"></i>
<i class="fa fa-bell-slash" show.bind="!soundon" click.delegate="switchsound()" title="click to unmute"></i>
</span>
</template>