This is what I have discovered and this may or may not be your solution.
When I udpated my macbook Al from 10.5.6 to 10.5.7 I had the monitor and corresponding USB (which also provides the audio support through this connection to the monitor) this caused the problem with the audio among other problems such as processing was slower. Why?: Apparently there is a bug in 10.5.7 and when you update you should download the 10.5.7 combo updater from
here
http://support.apple.com/downloads/MacOS_X_10_5_7_ComboUpdate
and have no peripherals of any kind pluged-in (including the 24" display).
In order for this to work I backed up my computer - did a clean OS install of 10.5 from the disk and performed the combo update with nothing installed on my macbook (including the 24" screen). Now everything works flawlessly and the system is much speedier. Please note after migrating my files out of precaution I used "Leopard Cache Cleaner" tools to repair settings and permissions that may conflict from the old install and the new one.
36 hours and problems seemed to be solved!
Good 🙂 luck!
Message was edited by: hotarucreative
Message was edited by: hotarucreative