Nikkei rebounds on BOJ rate-cut talk, worry lingers

*Nikkei rebounds more than 7 pct before paring gains

*BOJ rate cut talk spurs rise, weaker yen also a boost

*But rises to be limited as worries about economy cling (Adds stocks, details)

By Elaine Lies

TOKYO, Oct 29 (Reuters) - Japan's Nikkei average jumped 6.4 percent on Wednesday as Sony Corp and other exporters surged after the yen weakened on talk that the Bank of Japan will cut interest rates at a policy meeting later this week. The BOJ will ...