“Play all variants” command is similar to the regular music pack album mode, it will play your music pack as an album in sequence, however it will play a random variant for each track, so instead of playing track1, track2, track3 etc in original mix mode (or whichever mode you have it set to) it will randomly choose a variant as it goes along. For example track1 might be played with key up, track2 with replace lead instrument, track3 remove percussion and so on.

You can add in more randomness with the “shuffle mode on” command and play random tracks AND variants when using this mode.

Global play mode has been replaced with “include all music packs on/off” this will include all music packs in playback, or not.

Simples.