Download of MusicDeviceHost 1.3.4 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 software belongs to Audio & Video Tools.
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 software for Mac OS X was originally developed by Mixage Software.
From the developer:
This application is a host for music devices audio units. Music devices are specialized OS X audio units that generate sounds in response to some control protocol (MIDI in our case), like virtual synthesizers.