I installed Ugly VSTi, chose my MIDI input, chose my audio interface in output options, loaded a VSTi and loaded a patch. When I play my MIDI keyboard the MIDI received indicator lights on and off but I got no sound. I checked and tested my audio interface with AudioMIDI Setup and it's fine. So I'm still looking for a free VST host. Anybody know a VST host that works with OS X Yosemite (10.10.5) ?