Jan 21(Reuters) - Barry Callebaut sold less of its cocoa products than expected in its first quarter, the Swiss chocolate maker said on Wednesday, as it faced cocoa bean price volatility and weak demand.

One of the world's top cocoa processors, which supplies chocolate for Magnum ice creams and Nestle's KitKat bars, said its sales volume fell 9.9% to 509,401 tonnes in its first quarter that runs from September to November.

Analysts were expecting 512,000 tonnes on average in a company-provided poll.

(Reporting by Paolo Laudani and Danny Callaghan in Gdansk, editing by Matt Scuffham)