I am using the Gunman asset pack. It uses events to trigger sound effects and other things On a weapon such as shotgun there are f events, 2 sound effects, fire and eject casing. Only 2 of the events occur.

Using latest pull of 3.7 and default gunman asset pack.

Modify main.lua corona example line 84 and init with Idle

table.insert(skeletons, loadSkeleton("Gunman.atlas", "Gunman.json", 240, 300, 0.4, "Idle"))

Then at line 138 replace the key event listener code with

Runtime:addEventListener("key", function(event)
    if activeSkeleton == 1 and event.phase == "down" then
        state = skeletons[activeSkeleton].state
        state:setAnimationByName(1, "Aim_Shotgun", false) 
        timer.performWithDelay( 500, function() state:setAnimationByName(1, "Fire_Shotgun", false) end )
    end
    return false
end) 

When you trigger this you will see only two events
event: Fire_Shotgun, Sound, 0, 0, 'Pump/Random'
1 event: Fire_Shotgun, EjectCasing, 0, 0, ''

In experimenting I put the the Fire_Shotgun on a different track than Aim and I get all 4 events.
BUT, trigger it again, and only get 2.

Confirmed fixed. thanks!