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Thanks for your response.

Are you sure my goal is possible in the real world? Does it require a super computer? I tried to get this to work several years ago on a less capable computer but gave up because of the latency problem. I'm trying again now to see if anything changed over the years. So far I'm not seeing much improvement in latency.

Today I installed "Fedora Jam". It's a version of Fedora designed for audio production so I assume it has the proper kernel optimizations. It comes with Qtractor pre-installed (and several other audio production programs). Unfortunately, the latency is not much better than Qtractor on plain vanilla Fedora 38. I'm running Fedora Jam from a live CD without installing it on my hard drive. I wonder if that causes latency. I hate to wipe out my hard drive to install Fedora Jam only to find out it makes no difference. However, I'd surely go through with it if I knew it would solve the problem.

My hardware setup couldn't be simpler. My M-Audio midiman device (black Anniversary model) is connected to the keyboard's DIN jacks on one side and to the computer's USB jack on the other.

Any other thoughts/comments are greatly appreciated.