MSSMixer is a control for monitoring and setting audio mixers in Windows. Provided in ActiveX and (when registered) DLL variants, with source code, the control provides a simplified way of setting volumes, channels and other controls in the mixer. The control is supplied with extensive documentation and sample programs in VB and Delphi to enable the complexities of programming mixers to be understood and overcome. Two-level registration makes the control low cost for hobbyists and freeware developers, whilst commercial software vendors can include the control royalty free.