nick b

It maybe lower tech, but for simplicity and more performance than a DAW (but in Linux only perhaps?) I just: Use Carla to route my Jack-compatible audio player to Jamulus stereo sinks (or mono if you're in mono I guess) with Carla ...and disconnect it from my main sink to avoid local echoes select an output volume I'm happy with in the player (the low-tech "mixing"...) play along...