The i Vortex and i Flow Virtual Reality trainers work with the Tacx Trainer software 4, Basic. This can be upgraded to Advanced if desired, but that is not a must. All complex features a real work out fanatic uses, are omitted from the Basic version. But still there is more than enough to train in a scientific way and enjoy cycling in the virtual worlds that are so lifelike that they cannot be told apart anymore from the real world. The Basic software is an excellent starter and makes entertainment accessible to everyone. The Tacx Trainer software 4, Basic contains two beautifully designed Virtual Reality terrains: the Valeggio road terrain in Italy and the Velodrome. Valeggio is completely new and equipped with roads with altitude differences and gradient percentages. 3D buildings and trees give the terrain a typical Italian character. Tacx Lighting creates the right atmosphere and recognizable sound makes the VR world complete. In the Basic software you always ride with one cyclist. If you want to ride races with more riders and compete against virtual, interactive opponents, then you should upgrade the software to Advanced.