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The morning after installing Fedora Jam I discovered it didn't improve latency at all. I thought it was working perfectly when I installed it late the night before but I had a parameter set wrong and was actually listening to keyboard output directly, not through the computer. In fact latency was variable. It could take up to 10 seconds from when a key was pressed until the note was heard.

After an untold number of hours reading about MIDI, real time OS, looking at Youtube, and reading Qtractor documentation I finally in desperation tried another MIDI interface. I purchased a cheap interface for about $3 on TEMU. Users said it worked fine, and by golly it seems to have eliminated latency completely, at least so far. I assumed my M-Audio Anniversary MIDI interface was reliable, but obviously not.

But there's bad news. My damper pedal doesn't work correctly. It sometimes plays a note, specifically the E above middle C. And it does other weird things occasionally, like refuse to stop damping when the pedal is released. Somehow pedal data is getting modified either in the MIDI interface or the software. I know this is true because I used a MIDI cable to connect the keyboard OUTPUT directly to the keyboard INPUT. The damper pedal worked correctly.

So that's where I am now. Latency appears to have been eliminated. But the system is still not usable because the damper pamper pedal doesn't work correctly. Any suggestions are greatly appreciated.

Many thanks to all of you who have responded already.