1. sounds like you forgot to add the ability to the Ability - Abilities - Ability field of the unit. The button will not appear if the unit cannot use the ability in the first place. An alternative is if your button under Ability - Commands - State is set to suppressed of the ability.
2. You need an Action actor to create sounds when an effect impacts. There can be tempramental so base it of the marine attack if you need it.
3. That error message is because your psi blades actor is of the Unit type and there can only be one per unit because it adds stuff like the minimap icon and portrait so having more than 1 would cause problems. Just use a Model actor type.
Here is a demo map where I did something similar to what you wanted
1. sounds like you forgot to add the ability to the Ability - Abilities - Ability field of the unit. The button will not appear if the unit cannot use the ability in the first place. An alternative is if your button under Ability - Commands - State is set to suppressed of the ability.
2. You need an Action actor to create sounds when an effect impacts. There can be tempramental so base it of the marine attack if you need it.
3. That error message is because your psi blades actor is of the Unit type and there can only be one per unit because it adds stuff like the minimap icon and portrait so having more than 1 would cause problems. Just use a Model actor type.
Here is a demo map where I did something similar to what you wanted
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg