Downloading Unjammit 1.4 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available.
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 software relates to Audio & Video Tools. This free software for Mac OS X was originally produced by Hyvart Software.
From the developer:
Unjammit! is a JCF media player that can play isolated tracks for each instrument. You can use the built-in song metronome for timing practice. The tool allows you to set the volume for the selected instrument or backing track. In addition, it displays music score or tablature.
You may want to check out more software for Mac, such as Speak or SH-201 Librarian, which might be related to Unjammit.