push up

Hello, my friends,

I was wondering how to direct the people to use this function, increase the volume:

As you can see from the picture at he bottom, there is something like a axle on the right side of the cassette that need you to turn it to increase or decrease the volume, I made up a sentence:

"Increase the volume of the cassette by push G up."

I have two question: one is whether push up make sense and another is that if I want to give instruction regarding adjusting the volume, is it enough to say in crease by push up. I mean whether the other way around‘s instruction could be omitted.

https://upload.wikimedia.org/wikipedia/commons/5/57/Walkman.jpg

I can't tell from the picture where the volume control is. If the control is a rotating disk or a rotating knob, we would say turn the volume up (or down). Even if the control slid up and down, I would tell someone to turn it down, just as we often still talk about dialing a telephone number even though telephones haven't had dials lo these many years. "Push up" the volume would be understandable but also recognizable as something said by a person who is still learning English.

Winstanley808 said:

If the control is a rotating disk or a rotating knob, we would say turn the volume.

It seems to be a rotating disk. Does up or down mean the direction people need to turn the disk to?