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Hi @albert_d . I use a MacBook Pro and a Focusrite 2i2 for my hardware set up . I record my vocals and guitar using MXR condenser mics that came with the 2i2 package. For the backing track I use a utility application called LoopBack. It allows the creation of virtual audio devices by combining applications that are running as well as hardware inputs. For example, when I am recording an improv I create a virtual device that integrates sound from Chrome (for the backing track) and my 2i2. LoopBack gives me the ability to set the individual audio levels for everything included in the virtual device. I use QuickTime to record. For this I select the audio source “LoopBack Audio” vs the 2i2. LoopBack works very well and allows the user to set up and save a number of different virtual device configurations that can be turned “on” when you need them and “off” when you don’t. LoopBack is a product of a company called Rogue Amoeba. There are some free utilities out there for Mac I have tried with which you can accomplish the same thing, however setting them up and using them seemed confusing to me. Loopback is very straightforward.
Sorry for the long winded answer! Hopefully it is helpful. Let me know if I misunderstood your question or if you have additional questions.