Yes, those are MIDI Controller numbers. The CC stands for Control Change and the number stands for the type of controller as per the Decimal column in the following table:
http://www.midi.org/techspecs/midimessages.php#3 So your numbers there are...
(CC91) - Effects 1 Depth (default: Reverb Send Level)
(CC93) - Effects 3 Depth (default: Chorus Send Level)
(CC11) - Expression Controller
(CC74) - Sound Controller 5 (default: Brightness)
Scott
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