I couldn't find an answer to this, so please forgive me if it's a repeat.

I must be missing something about the in-game radio. I read that we can put our own songs, formatted properly, in "\TankMechanicSimulator\TankMechanicSimulator_Data\StreamingAssets\Music\UserRadioStation."
However, doing this has no effect. With the radio, on the desk in the office, the only options I have are to turn the radio on or off; there is no selection for which 'station' to pick. When I turn it on, it plays the songs from "RadioStation1".
What I finally did was just place all the songs in RadioStation1 and turn on the radio. It works fine-ish, just not the way I expected.

My question is, is the radio tunable? Am I missing something about this?

Thank you.