Hi there,
This falls into custom development as this is feature is not native to the theme so we can’t really provide you with the exact code that you need.
But based on the current code that you have, I am not certain where you added it.
What I can suggest is that you could create a template in the child theme that targets the specific post category page.
To do this, you will have to override the file _content.php that is in \x\framework\views\global,
Copy the file from the parent theme and place it in the same directory of the child theme then the file content should be like this:
<?php
// =============================================================================
// VIEWS/GLOBAL/_CONTENT.PHP
// -----------------------------------------------------------------------------
// Display of the_excerpt() or the_content() for various entries.
// =============================================================================
$stack = x_get_stack();
$is_full_post_content_blog = is_home() && x_get_option( 'x_blog_enable_full_post_content' ) == '1';
?>
<?php
if ( is_singular() || $is_full_post_content_blog ) :
x_get_view( 'global', '_content', 'the-content' );
if ( $stack == 'renew' ) :
x_get_view( 'renew', '_content', 'post-footer' );
endif;
elseif ( in_category('audio')) :
x_get_view( 'global', '_content', 'the-content' );
else :
x_get_view( 'global', '_content', 'the-excerpt' );
endif;
?>
Notice the lines:
elseif ( in_category('audio')) :
x_get_view( 'global', '_content', 'the-content' );
else :
That is added to the code to check if the category of the post category slug is audio and if it is, it will use the file that is in \framework\views\global_content-the-content.php which displays the entire content of the post instead of \framework\views\global_content-the-excerpt.php that only displays the excerpt of the post.
Hope this gets you started.