Apple has posted DVD Studio Pro 1.5.1, as noted by MacUpdate. The update address the following issues: incorrect A.Pack monitor Sample rate, 24-bit AIFF files contained digital noise, macrovision APS bits, setting SSCRST with CPSEC and PES bits when writing DLT tapes, and region 7 setting flagging as playable, and also improves stability for DVD-ROM burning. DVD Studio Pro sells for US$999; the update is a free download.
