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Hi, thanks for you reply, my problem has been solved. When I was preparing to set the shortcut according to your prompt, I found that Qtactor has already recognized the PLAY and STOP button of my BeatStep Pro without any settings. In the Qtractor's MIDI message info window I saw the following message:

MIDI MMC: PLAY
MIDI SPP: STOP
... etc

I don't know why this couldn't be done before, but now it's working, which is great. Thanks again for your help.