in express scribe 4.03 with mac os 10.3.8 giving cracking noise every 1 hour . Tested in 5 eMac machine (1ghz 256mb, 40mb ,cdrom)and powermac machine G5/2GHz/512MB/160GB. Tried reformatting the drive and reinstalling the app: The problem persist. Needs to restart the app: to get the app: running without problem for 15 minutes. Tested with headphones and Speakers( multiple units/brands). Can any one suggetst a solution......