![]() Indeed, if you work your Mac hard with other memory-intensive tasks, then try playing piano, you'll notice a delay while it brings those blocks back from swap. Although its memory footprint is large, most of it will be swapped out to disk, leaving only the blocks necessary to handle piano playing in RAM. ![]() GarageBand takes a while to load, but if it's not recording, playing back, or monitoring a real instrument, then its CPU load should be minimal, and it should not be doing disk IO. Leave it open on a song with only one track, a piano track. However this is a reasonable amount of trouble to go to, when it seems to me that simply leaving GarageBand running would do the job. It claims to be "small on memory and CPU usage". I have not tried it myself, so this is not a recommendation. With CBR encoding the bit rate and size of the encoded stream are known prior. When using CBR encoding, you specify the target bit rate for a stream, and the codec uses whatever amount of compression is necessary to achieve it.
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