12Step 1.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application lies within Audio & Video Tools, more precisely Music Production. This free Mac app is a product of Keith McMillen Instruments. 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.
From the developer:
12 Step is a chromatic foot controller pedal for Mac. It sends MIDI notes via USB or the KMI MIDI Expander to control soft synths, MIDI Keyboards and MIDI sound modules. It has
polyphonic capabilities and can play up to 5 notes per key. Each key is velocity and pressure sensitive and can use the tilt of your foot to control pitch bend, polyphonic aftertouch, or any MIDI CC value.
You may want to check out more Mac applications, such as M-Audio Key Rig, which might be similar to 12Step.