Download of pianoATL 1.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free software for Mac is ButtonBass.
The program lies within Audio & Video Tools, more precisely Music Production. 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.
From the developer:
ButtonBass ATL piano is a free app that allows you to play the ATL Piano with your computer keyboard. Sync sounds using the space bar and stop sounds using the enter key. Script out songs in the player. This application has an intuitive user friendly interface.
You may want to check out more software for Mac, such as Mandala Virtual Brain, Bouncy or SmallScreen, which might be related to pianoATL.