In the case of Throw Voice, I added a summon decoy effect to the third word by
1. duplicating the Phantom Form Actor
2. creating a new magic effect which summons this actor
3. creating a new Voice spell which includes the effect for the third rank of Throw Voice as well as the new Summon Decoy effect
4. selecting the new Voice spell in the dropdown menu for the third word of the Throw Voice shout
This worked very well. However, when I tried something similar for Aura Whisper and Animal Allegiance, the secondary effects are not triggered in-game.
Any idea what I might be doing wrong?
Aura Whisper:
1. created new Voice spell which includes the effect for Aura Whisper's third rank, as well as value modifier effects for Fortify Sneak and Fortify Pickpocket (AlchFortifySneak, AlchFortifyPickpocket)
2. selected the new Voice spell in the dropdown menu for the third word of Aura Whisper
Result: Aura Whisper effect works fine, but there is no boost to Sneak and Pickpocket
Kyne's Peace:
1. duplicated the PowerImperialPacify spell (Voice of the Emperor)
2. created new Voice spell which includes effect for Kyne's Peace third rank as well as the new pacify spell
3. selected the new Voice spell in the dropdown menu for the third rank of Kyne's Peace
Result: Third rank of Kyne's Peace works fine, but the pacify effect does not get triggered.