Welcome to the Jamroom forum!
You're on the right track - what you want to do however is remove the "template" - the "item_index.tpl" is designed to be the
index for the module - i.e. an entire page.
Instead, you are going to want to actually do your listing in the index - i.e.
{jrCore_list module="jrAudio" profile_id=$_profile_id order_by="audio_display_order numerical_asc" pagebreak="6" page=$_post.p pager=true}
Would add an audio list. Note that the action template (modules/jrAction/template/item_index.tpl) is fairly complicated - you're going to want to tweak that to suit your needs.
Also - if you are looking to just get the audio page as the profile index (or allow your users to select what page they want to be their "index" page) make sure and check out the Profile Tweaks module:
https://www.jamroom.net/the-jamroom-network/networkmarket/2/profile-tweaks
Hope this helps!
--
Brian Johnson
Founder and Lead Developer - Jamroom
https://www.jamroom.net