Edit - you have headphone out on the amps so you can just go with a simple mixer to add the audio source. I have a mackie 8 channel but you can go way cheaper if you want. I also use the mixer to add in a metronome or drum track playback. You'll be surprised how fast inputs get used.
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Like others have said a basic audio interface and mixer is all you should need.
I have macbook USB -> Presonus audiobox -> L/R to mixer inputs -> headphone out of mixer. Can use the audiobox to balance between bass volume and track volumes. I can also record into garageband this way (or you can use the PC equivalent audacity) to record and practice.
I practice every night this way.
For ideal practice i eq out the bass on the track so i can play over it.
Can use either the computer or a phone for playback.
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Like others have said a basic audio interface and mixer is all you should need.
I have macbook USB -> Presonus audiobox -> L/R to mixer inputs -> headphone out of mixer. Can use the audiobox to balance between bass volume and track volumes. I can also record into garageband this way (or you can use the PC equivalent audacity) to record and practice.
I practice every night this way.
For ideal practice i eq out the bass on the track so i can play over it.
Can use either the computer or a phone for playback.
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