A later section when Astro is lifting the robot into the air, the voice of the robot is distinctly female in the Japanese version.
Hmmm actually it isn't quite distinct... it sounds almost like a child and having watched a LOT of anime i can say there are a lot of male voice actors with higher voices ^^;
As for ABC I got this off an Australian Anime Mailing list i'm subscribed to:
"While waiting for Dr Who to start I tuned into the ABC way early and
caught the end of "The Saddle Club". Right after the show I saw a promo
advertising Astroboy and the date of its (re)appearance on Thursday April
15."
As for Sony for those looking for the Sony Pictures Entertainment website for Australia there isn't really one just the distributor side of things. However searching their website i did find an appropriate point of contact:
contactus_australia@spe.sony.com