SFX Machine RT 1.05 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 program is categorized as Audio & Video Tools. We recommend checking the downloaded files with any free antivirus. The actual developer of this software for Mac is The Sound Guy, Inc.
From the developer:
SFX Machine RT supports VST and Audio Unit formats and provides full MIDI parameter control for automated preset modification, using a simple MIDI Learn system which allows new dimensions of interaction. The Randomize button automatically adjusts the position of each of the non-volume sliders, making it easy to get an idea of the range of possibilities contained within each preset.
You may want to check out more Mac applications, such as Machines at War 3, MacAssistant RT or The Time Machine - Trapped in time, which might be related to SFX Machine RT.