Initially we wanted to remove our JAX Stereo Tool in favor of the new JAX 3Stereo, where it is integrated. Some users did want to keep the classic tool (one of our first releases). So we updated the old code for latest frameworks and devices and re-adjusted the price.
Users of our JAX 3Stereo do not need the legacy JAX Stereo Tool. Because 3Stereo implements the same tool in its all-pass mode.