custom audio player

// Add Shortcode
function knr_audio_shortcode( $atts ) {

	// Attributes
	extract( shortcode_atts(
		array(
			'src' => '',
		), $atts )
	);

	// Code
$attr = array(
	'src'      => $src,
	'loop'     => '',
	'autoplay' => 'true',
	'preload' => 'metadata'
	);
return wp_audio_shortcode( $attr );
}
add_shortcode( 'knr_audio', 'knr_audio_shortcode' );