Original sentence: A number of early adopters have complained that their device's screen could not properly display shades of black.Because the new applications are considered an upgrade, many owners of the "A" model feel the applications should have been provided either at no charge or at a lower price.Immediately after Steve Jobs announced the price charge for the upgrade on-stage, "some slight boos coming from the audience" could be heard.Others have complained about a hissing noise while using the iPod touch.Various unofficial explanations have surfaced, such as the GAAP explanation that was used by Apple when it charged a US $1.99 fee to enable IEEE 802.11n on some of its computers, which has been questioned by customers and the financial community.Within days after the announcement, several movements within the iPod touch community have developed, including the use of Apple's feedback page, as well as creating open letters to Jobs and creating an on-line petition form
Edited sentence: A number of early adopters have complained that the screen on some devices could not properly display shades of black.Some users have complained about a hissing noise while using the iPod touch.This defect affected only the first few batches of iPod touch screens manufactured within the first few weeks of production.This issue seems to affect a small minority of iPod touch users.iPod touch screens produced since then do not seem to have this problem