I had some trouble recently setting up the LTEK dance pad with e.g. Project Outfox on the steam deck, so here is a quick guide:

Problem:

• LTEK up arrow not recognized by steam deck or project outfox

Solution:

• Navigate to steam menu->controller->test device inputs->begin test
• Click "setup device inputs", I did this by using tab on a USB keyboard but it may also be possible w/onscreen keyboard or touchscreen
• Press the buttons on the pad to change the steam deck mapping to e.g. ABXY. Other settings can be skipped.

All four buttons should now be recognized by apps. You can change the mapping as needed within project outfox now.