Hopefully, this information isn't redundant and posted elsewhere.  I wasn't able to locate this information in either the Helix manual or the HX Stomp manual.  To the contrary, both manuals list CC71 as "reserved for future use".  However, I have found that these commands do work on Helix Floor and I assume they may work on Helix Rack, and HX Stomp.   Footswitch Mode - Stomp - CC71 - Value 0 Footswitch Mode - Preset - CC71 - Value 1 Footswitch Mode - Stomp Edit - CC71 - Value