I gave my DS a sound machine for his stocking last year and he and his friends have had a surprising amount of fun with it (can't recommend it enough for any child between 5 and 10, seems to appeal to everyone!). I am looking now for a simple but fun gimmicky sort of thing that might meet with similar success, and thought that a voice changer might be it!
Something like this:
www.amazon.co.uk/Voice-Changer-Megaphone-flashing-lights/dp/B001CM1K6S/ref=sr_1_1?ie=UTF8&qid=1413807383&sr=8-1&keywords=voice+changer
or like this:
www.amazon.co.uk/Yada-Voice-Recorder-colours-vary/dp/B001CDFDOW/ref=sr_1_3?ie=UTF8&qid=1413807383&sr=8-3&keywords=voice+changer
Does anyone have experience of either of these, or of something in the same realm that might appeal to a 9yo?