dkpdf_remove_shortcodes_bytag.php

<?php
// removes specific shortcode in PDF
function dkpdf_remove_shortcodes_bytag( $content ) {

	$pdf = get_query_var( 'pdf' );

	if( $pdf ) {
		remove_shortcode( 'responsivevoice' );
		add_shortcode('responsivevoice', '__return_false');		
	}

	return $content;

}
add_filter( 'the_content', 'dkpdf_remove_shortcodes_bytag');