Audio Plugin Player
Audio Plugin Player is a lightweight VST and AU instrument plugin host, that allows you to play these instruments using either your mouse, computer keyboard, or MIDI device (both hardware and software MIDI devices supported). It has a simple, one-screen interface, that will let you start making music with your favorite audio instrument plugins in seconds – just drop your plugin onto the application window, make your input and output choices, and you’re ready! Audio Plugin Player allows you to route your plugin instrument through a plugin effect (either VST or AU), and also lets you route external audio through a plugin effect too.
The application is written entirely in Max 6.