Stuck notes from external midi device

I just started using Logic today for the first time. I hooked up a MOTU midi express XT as an interface between my MacBook Air and a Proteus Orchestral synth (old rack model). Also hooked a FATAR keyboard (controller) to the interface. Everything shows up fine in the audio / midi setup windows. I was able to figure out how to set up several tracks in Logic pointing to the multiple channels on the external midi device (synth). So far, so good. But when I started recording the tracks I ran into stuck notes from the synth. I've had this in the past on other sequencing software and don't remember how to solve it? In addition, while recording the tracks from my keyboard controller notes would occasionally not play, almost like there was a memory / cpu problem.
Any thoughts would be appreciated.

In case you need to get back the default Logic control surface setup you can delete the Control Surface preference file and the default file will be rebuilt. It's a good way to get back to Logic's initial control surface setting. Also, if you had chosen to edit the Logic Remote CS entry instead of remove it there are adjustments that can be made, like disabling Active Sensing, or even disabling "Flash Mute and Solo Buttons" on the basic Control Surface Preferences pane.
Deleting the Logic 10 Control Surface Prefs.
In the Finder, choose Go > Go to Folder from the menu.
Type ~/Library/Preferences  in the "Go to the folder" field.
Press the Go button.
Delete the com.apple.logic.pro.cs file from the preferences folder.
Note: to get to the User-Library the tilde ~ has to be included.        ~/Library/Preferences

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