So far I use this when I'm doing just headphones. Just plug it into the bass and then plug your phone and headphones tnto that. Easy-peasy
Vox amPlug 2 Bass Headphone Guitar Amp
Vox amPlug 2 Bass Headphone Guitar Amp
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Thanks for all the help guys, really appreciate it. I looked up the NUX Mighty Plug Pro and that looks like what I was wanting to do.
NUX Mighty Plug Pro MP-3 Headphone Amp for Guitar/Bass, Various Effects, Amp Modeling, IRs https://a.co/d/5dUZPiA
There is also this one that looks like it does the same thing but half the price. Not Bluetooth compatible but can plug directly into a phone or iPad.
IK Multimedia iRig 2 Portable Guitar Audio Interface, Lightweight Audio Adapter for iPhone, iPad and Android Smartphones and Tablets,... https://a.co/d/5mXThRA
Not sure which one to get. But again, thanks to all that posted because now it's possible to do what I had no idea about just last night.
Lots of options. I see you're already found your solution but given that your amp does not have an aux-in for your music playalong, I'd lean towards getting a small mixer and cables.
Example, you could get this mixer get an XLR cable and go from the direct out of your GK MB500 into channel 1 of the mixer. You can get an appropriate cable that connects your phone to mixer channel 3/4 with this cable plus this cable if you have an iPhone. You can then run your headphones out of the headphone "phones" jack.
What do you think?
One big difference is that the iRig must be plugged into a phone or iPad to work. The NUX works with just a bass and headphones— so if you are practicing without backing tracks no need to tether yourself to anything.
I think there is a lot of ingenuity coming from people on this site. "More than one way to skin a cat". Can't thank you all enough. I'm amazed at all the different ways that have been recommended when I wasn't aware of ONE when I started this thread 24 hours ago.
Again, I just ended up getting the iRig 2. Should be delivered Saturday morning. I'll see how it goes. If it doesn't mesh well, or seems to be under performing or a bit cumbersome, you all have provided me with many different ways, some more expensive than others, but again, many different ways to achieve the goal I want.
Definitely some good people on this site.

Can you record stuff to you're phone with that? (iRig 2)
I'm thinking that if it does it would good for those "I need to record this riff before I forget it" type moments
. . . especially if you can send it to bandmates
Yes, it does let you record to GarageBand for Apple or most other recording apps according to the description.
IK Multimedia iRig 2 Guitar Interface for iOS and Mac
well….I ended up ordering the iRig2. If it doesn't mesh easily with everything I'm gonna go the NUX mighty plug. Looks nice but I'm paying 49.99 and the NUX is $109. We'll see what happens but I will post here with my impression of it. Should have it sometime Saturday.
I have been using a Korg Pandoras box for years. I think the one I have is the PX-4. I don't think they make them anymore but you can find them used for like $50.Searched for this and can't seem to find exactly what I'm looking for. I need to play my bass through headphones instead of my amp sometimes. Ok, easy, I plug my bass into the amp and the headphones into the headphone line out. But……….how in the heck can I play along with music I have in the Amazon music app on my phone?
Im having difficulty figuring out how to get the music from my phone to play in the headphones along with the bass guitar. I usually would stream my iPhone to a Bluetooth speaker and then play the bass coming out of my amp.
Is it possible to do both but have it all coming through the headphones so nobody else hears it?
That's cool.Been doing it for decades...![]()
+1 for the NUX mighty plug.The NUX Might Plug Pro has headphone output and connects to devices either via USB or Bluetooth.
Mighty Plug Pro - NUX (nuxefx.com)
That's cool.
What amp do you use? Must be a unique design.