I have been working with the SuperCollider audio Units Wrapper. The plug-in is a basic tremolo unit, suitable for an effects send bus. It has a nice clean sound, and you can automate the modulation frequency. Available for download here
and learn more about creating your own Audio Units Effect:
To install simply download and place in the /Library/Audio/Plug-Ins/Components of the system or your home directory. Then restart your audio units compatible host. I have tried it with Ableton Live and AU Lab, and had a lot of success.
Posted by Strohan