carbonmonoxide wrote:
Smile while you talk, it really helps.
As annoying as this may feel, it really does work. This is what people who do the voiceovers for commercials do - I find it sickly irritation, but apparently this is something people subconsciously like to hear, they register it as friendly and good-willed.
Maybe you can find some youtube videos to help with this problem? If it's a script or set of scripts, show them to people without an intonation problem and let them teach you how to do it - you can practice with them.