The effects plug-ins maker SoundToys has announced its limited-time Monster TDM Upgrade special, which offer promotional pricing on upgrades from single TDM plug-ins or combinations of plug-ins to the full SoundToys TDM Effects bundle. From now through September 20, 2007, you can "trade in" your SoundToys plug-ins for credit toward the bundle.

There are nine TDM Effects (Mac/Win): EchoBoy, FilterFreak, SoundBlender, PhaseMistress, Speed, Tremolator, PitchDoctor, PurePitch, and Crystallizer.

For full details and pricing information, visit www.soundtoys.com.