Streichfet receiving on all MIDI channels

Hi all; just purchased a striechfet and it is definitely receiving all MIDI channels, so stuck in OMNI mode. I have set the MIDI channel to 2, by holding down all 4 buttons, and then playing a note. If i change to a different MIDI channel (3) on the sequencer or keyboard, to play a bassline from another instrument, it now starts to play these notes on MIDI CH3.
Driving me mad, really appreciate some pointers. Thanks