You can use some javascript code to call the STICKY Footer player and its functions. Here are a couple of javascript functions you can use.

Load the sticky player and Play a specific playlist:

IRON.sonaar.player.setPlayerAndPlay({ id:"1218", trackid:"0"});

id 1218 is the post ID of your playlist post type you want to play. To find out your post ID, see screenshot: https://d.pr/i/KH79f2
trackid 0 would be the first track of the playlist, 1 would be the second track, 2 would be the third track, etc.
Attributes parameters available: “id”, “trackid”, “shuffle”,”soundwave” and “notrackskip”.

Play the track that is set in the sticky player:

IRON.sonaar.player.play();

Pause the current track:

IRON.sonaar.player.pause();

Set the volume at 50%

sr_setVolume(0.5);

Start a specific playlist or widget player at a specific time:

sonaar_ts_shortcode({id:"", widget_id:"", trackid:", time:""});

id is the post ID of your playlist post type you want to play. To find out your post ID, see screenshot: https://d.pr/i/KH79f2
widget_id would target the player/widget ID set in your DOM.
trackid:”1″ would be the first track of the playlist, trackid:”2″ the second track, trackid:”3″ the third track.
time:”10:00″ would start the player at 10 minutes.

If you want to trigger click on the NON sticky player (aka free player), you can use this JS code:

jQuery(‘[data-albums=”75″]’).find(‘li:nth-child(2) .audio-track’).trigger( “click” );