The newest version (v401) is the best Hijack version to use.

Animations (other than the built-in Rio/Empeg ones) work only with Hijack installed, and cease to work when Hijack is removed.

Hijack can be removed by reinstalling any version of the player software over the serial link. Most users find this a nuisance, and immediately reinstall Hijack after such upgrades.

With Hijack already installed, one can use the ethernet upgrader tool to more rapidly switch between software versions, instead of the very slow serial port method. As a bonus, the upgrader tool does not blow away Hijack.

Cheers