Goldman Sachs today , saying it expects little sequential growth from the company's iPod line, but saw steady unit sales this quarter, according to Forbes.com. Goldman said that iPod shipments were tracking in-line with its 5.35 million unit shipment forecast for the June quarter. "Based on a series of checks throughout the supply chain, we expect sequential iPod growth to come in lower than what investors have become accustomed to," the research firm said. Goldman said that Apple's second-quarter upside should be less than it has been--with much of the upside driven by the company's Mac business.