GRID is not a full blown VJ mixing program but a clip triggering program with a unique interface and very good scratching, scrubbing and midi support. It also supports uncompressed component video, DV and highend output cards meaning it is being used a lot in theatre and other areas besides the VJ world. I believe GRID and VJAMM are the only VJ Apps with good solid support for scrubbing with DV and component video. It also has good solid audio support, another reason why it is in use by the theatre and AV crowd.