yogiboy,
That statement can be a little confusing, but I don't he is asking for a balance control and this is what he means.
"button that you turn from left to right to adjust the volume" - a knob that you turn clockwise(left to right) to adjust the volume
"instead of separate buttons to raise/lower the volume" - an electronic volume control with + and - buttons
so, he just wants a conventional knob to adjust volume.
That statement can be a little confusing, but I don't he is asking for a balance control and this is what he means.
"button that you turn from left to right to adjust the volume" - a knob that you turn clockwise(left to right) to adjust the volume
"instead of separate buttons to raise/lower the volume" - an electronic volume control with + and - buttons
so, he just wants a conventional knob to adjust volume.