The changes are instant when you hide or show a track on your Promo settings screen, so resending email invitations is not necessary.

1. Hover over the Promos tab at the top of the page and click My Promos.

2. Select a promo from the column on the left side of the page.

3. On the right side of the page, scroll until you see the promo tracklist.

4. Click the slider next to each track to toggle between the "hide" and "show" options.

As an example, Three tracks in the promo below are hidden. Click Show to make the tracks visible again.

*** Hidden tracks are not included in a promo's ZIP download. ***

Here is what the promo listener will see: