Mr. DJ is a program to mix several audiofiles. You can use it as a personal studio. It's programmed in VB, uses Windows Media Player (behind the dashboard) and has a familiar Windows Interface.
Mixwave is a 16-bit .wav file mixer/editor developed on top of an application framework by Douglas A. Young, which latter is contained in the book 'Object-Oriented Programming with C++ and OSF/Motif' 2nd. ed., pub. Prentice-Hall.