Hi guys, got this figured out. Turns out rather than trying to define a “$tracks” variable, which can obviously only store one item, i left out the sub-repeater loop in the declaration area and simply used
<div class="talenthalf"><strong><u>Audio Samples</u><br />
<?php
if( have_rows('audio_samples_parent') ): ?>
<ul>
<?php
while( have_rows('audio_samples_parent') ): the_row();
?>
<li>
<audio controls>
<source src="<?php the_sub_field('audio_tracks'); ?>" type="audio/mpeg">
</audio>
</li>
<?php endwhile; ?>
</ul>
<?php endif;
?>
</strong></div>
to loop through the files uploads. Hope this helps someone else!
