Today I faced an issue with high CPU usage and Pianteq.
In my rackspace I am using the MIDI Filter to block NOTE ON messages.
This is working fine, but I noticed that Pianoteq was using CPU and no sound could be heard.
Then I investigated and found that NOTE OFF messages sent to Pianoteq consume CPU.
This is because NOTE OFF messages are processed in this plugin - what is good for a real simulation of a Piano.
The solution was - in this use case it is possible - to filter out not only NOTE ON messaged but also NOTE OFF messages.
I know there is a danger of hanging notes …