Downloading Speedshifter 4.1.2 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.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This program's bundle is identified as Speedshifter.
This free software for Mac OS X was originally created by The Associated Board of the Royal Schools of Music. The most popular version among the program users is 1.0. The application's installer is commonly called SpeedShifter.dmg. The program relates to Audio & Video Tools.
From the developer:
Speedshifter is a practice tool from ABRSM that allows you to vary the speed of audio from CD or MP3 without altering the pitch.
Simply load a track and turn the dial to slow it down or speed it up - the pitch remains the same. If you load an ABRSM minus one track Speedshifter will know the starting tempo of the track and position the dial automatically at the correct point on the tempo/BPM ring.
You may want to check out more software for Mac, such as Stomp, Live or OSCulator, which might be related to Speedshifter.