jamMix 1.1.18 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Audio & Video Tools, more precisely Music Production. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The actual developer of this free Mac application is Zivix LLC.
From the developer:
jamMix is a companion app for the jamstik, providing instant music-making fun for iPad, iPhone, and iPod. The fun of jamMix is all about having immediate access to play with musical parts and pieces in a simple interface likened to a musical box of Lego’s. The app comes with tons of cool loops, auto-chord mode, and the ability to jam along to your favorite beats.
You may want to check out more Mac applications, such as M-Audio Key Rig, which might be similar to jamMix.