Freezes the intensity on the current level while the current theme is playing.
The automatic decrease will continue when the playing Theme is interrupted or forced to end, e.g. by calling stopMusic() or returnToLastBasicMood(). Triggering the same Theme again will change the Intensity to the newly triggered value, but will not result in reactivating the automatic decrease.
Note: Calls to holdCurrentIntensity() will be ignored while in Menu Mode or in Cutscene Mode. Call MenuModeLeave() or CutsceneLeave() first.