I like to setup the "one switch looper" in hx stomp with switches from my MC6.
There is a midi cc 49 for emulating the fs1 but i cant figure out how to set it up in
my Morningstar
Press - Rec, press again - play works but how to setup double press=erase loop
I think I remember reading that this is a known issue with using CC's to control the HX Stomp over MIDI. If you look at the Stomp manual, there is no CC under the looper controls to clear the looper contents. I'm betting the reason you're having trouble with setting a double-tap from a simulated (i.e. MIDI) version of FS1 is that the Stomp only recognizes double-taps from a hardware switch directly connected to the unit. Couldn't tell you that that's a fact, just my guess.
The current workaround, I believe, is to use the direct CC MIDI command to the looper (i.e. CC 60, value: 64-127) to force the looper into record mode, which overwrites everything currently in the buffer, and then quickly follow with a stop command. Not ideal, but you're kinda limited by what the Stomp exposes to the outside world.