Sonor Artist and MP3 backing tracks

I wasn't sure where this would fit better so I posted this in the hardware forum as well.
I'm going to be using Sonor Artist on a laptop to run MP3 backing tracks. Should I use a MobilePre or similar product for my sound output? Or since they are already MP3's, would the onboard laptop sound be sufficient? 

I have been using a laptop for backing tracks for around 14 years now.
If they are just stereo tracks then you do not really need Sonar. Sonar is a complicated program that to me requires an audio interface to be stable. It will work but it's not really optimized for straight playback.
I use Win Amp.
I use win amp because it has never crashed or caused issues.
It is also the only playback software I ever found that can be set to stop after each song plays.
You can read more about my set up here.
http://www.cactusmusic.ca/johns_rig.htm
 
 
In the past I have mostly have used the on board sound of my laptop. Main reason was hooking up the interface was extra stuff to do at a gig and one more thing that could go wrong. I used to have an M Audio interface that would drop out all the time. 
I also don't like having to dismantle my studio to go do a gig.  
These day's I'm using an el cheapo Behringer UCA 200 USB interface which I find ideal for the reasons I would never use it with a DAW. It has simple generic codex so is plug and play. It is also buss powered, another item I would not use in a DAW interface, but this makes it that much easier to set up.
 
Some laptops will have a grounding issue when used with the on board output jack. I had to use a ground lift sometimes with one laptop I owned. My latest one is fine.
 
Audio wise of course an audio interface will have better specs than what is built in to your laptop. So using an interface will improve your overall sonic boom.
So I use the interface but always have one of those mini jack to 1/4" patch cables patched to a back up device. Always have redundancy when gigging. 
 
I'm thinking of trying Sonar and using it's playlist feature someday just to be able to split out my Bass track and to send MIDI patch changes to a few gizmos. But I tend to keep things simple and stereo backing tracks have works for me for a long time now. I have the PA set up in the studio so proof my mixes that way.
 
If anyone out there knows of software that can be told to stop at the end of each song please let me know. Win Amp is no longer supported so will eventually die.  Still runs on Windows 10 even though there's no updates for a few years. The people who make Reaper had something to do with it.