Based on recent checks in Asia, Banc of America has said it believes iPod production is being cut, while iPhone production orders remain volatile. According to the firm, iPod March quarter production numbers appear to have been noticeably reduced, down between 10-20 percent from early January, and down 30 percent or more from early December. The group believes these new figures suggest that Apple may see a 5-10 percent decline in iPod unit sales year-over-year,…