Currently with Windows and other OSes, applications can have their own volume control, and you have a main system-wide volume slider.

It was originally a simple dialog box with 4 volume sliders for each of the 4 supported tracks.

Left clicking would give an application-specific menu (which might include some active controls like volume sliders).

There are individual volume sliders and output jacks for each instrument group, which is unusual for digital drum machines.

They consist of volume sliders or rotary controls that represent each individual source, which may be accompanied by balance and mute controls.

The Polymoog has a 71-note weighted Pratt & Reed touch-sensitive keyboard divided into three sections with a volume slider for each.

There is a tempo control, a volume slider, rhythm buttons and other controls.

It showed a spectrum analyzer, and color changing volume slider, but no waveform display.

The My Radio button and a volume slider on MSN Explorer make it simple to switch on the Internet station of your choice.