Steinberg releases a distributed computing system for Cubase VST. This allows the scaling of the DSP power of a VST system by adding additional CPUs. These can be old redundant PCs, the only requirement is each machine has an ASIO soundcard.
The PCs are linked by standard digital audio cables, VST System Link uses a single bit of the audio stream to hold all of the transport and synchronisation data with further bits holding MIDI information removing the need for MIDI cables between PCs. This allows any PC within the network to control the VST instruments on another.
This technology will allow several people to work on a project at once, each on their own PC (or MAC as it is cross and mixed platform capable). There are many applications for this system (detailed on their website www.steinberg.net ).
Update:- The news on licensing is not currently good. You will need a full version of Cubase or Nuendo on each PC connected by System Link. This means it isn't a practical way of making use of old PC's. Better news is that System Link will be bundled with Cubase and Nuendo at no extra cost.
VST Link is available with Cbase VST and Nuendo from Q1 2002