Default volume on startup, steering wheel controls

I have been running the Joying 3188 standard double din in my car for 3 months now. I have a couple questions, and wanted to see if anyone has run into the same issue
Any way of changing the default volume on startup? I have an Audison Bit Ten DSP in my car which I'm controlling my volume through, problem is every time I start my car the head unit starts at a volume of 12 and have to turn it up every time.
Also, I have the CarService app running automatically on startup, but if I turn off the car and the head unit goes into standby, then start the car back up within 30 minutes, CarService wont automatically start. Its only when the head unit fully shuts down that Car Service will start up again

Not a big deal, but I got N7player running on it. When I shut the car off, the head unit goes into standby and the music will continually play in the background for the 30 minutes, any way of having it automatically pause when I turn off the car?

I feel that all these problems could be solved using tasker, but I havent the slightest clue how to use it properly. Does anyone have solutions?

Thanks

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