Navigating from Hidden Slides to the Landing Slide

Hi,

In a course we developed, we have one slide which has three clickable icons. When the user clicks the icons, he/she will go to the corresponding hidden slides. After viewing one hidden slide, to move to the next hidden slide, the user has to click a back button added on the screen (not the back button on the player) which would take the user to the landing slide with the clickable icons. Now the issue we are facing here is, the landing slide has audio and animation. When the audio of the landing slide is completed, the users are allowed to click the icons to go to the hidden slides. So when the user clicks the back button from the hidden slides to go to the landing slide, I don't want the landing slide to start over from the beginning; it should stay in the state the user left it. However, if somebody navigates to this landing slide using the back/next button on the player, I want this landing slide to start over (as it should ideally).  

So, in short, here is what I am looking for:

1) While navigating to the landing slide from a hidden slide using a custom back button on the screen, the landing slide should be where I left it.

2) While navigating to the landing slide from another normal slide using the prev/next button in the player, the landing slide should start over. 

Is this possible?