Digidesign on Thursday unveiled Pro Tools 7.4.2 for Mac, an update that addresses compatibility problems with Mac OS X 10.5.3 Leopard and Pro Tools 7.4 HD, LE, and M-Powered. The update requires the new OS version, but does not resolve an issue with ATTO SCSI cards that 10.5.3. Digidesign recommends that ATTO SCSI users keep Pro Tools 7.4.1 and Leo
