I noticed my CPU was showing an unusual level of activity with nothing playing. I removed all plugin instances and re-introduced ANA and the CPU load went back to zero. br
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After playing one note on ANA the activity returned and remains constantly. CPU meter is dancing around with nothing playing. Seems to be related to the reverb, once I turned reverb off CPU activity dropped to negligible.br
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Mac Core i7 2.3 br
Logic Pro 9.1.8 32bitbr
OSX 10.8.2