Omnitronic's VC-11 passive volume controller is a device to control the volume of analogue audio signals. For example, you can use it in your PC setup for your speakers or amplifiers.
Whenever your amplifier isn't set up within immediate reach for quick volume adjustments, the remote-controllable Omnitronic LH-125 volume controller is a great solve.
The VC-22 is an active volume controller from Omnitronic. It lets you finely adjust the volume of analogue audio signals. It can also be connected to Bluetooth for remote control.