Po-12 Step Multiplier not working

Pocket Operators
12

I bought mine 2nd hand. So no idea if its newer or older. Just to be sure, the step multiplier (I call it “flam”) is activated this way:

  1. Select a sound (i.e. an instrument) w/ “Sound” + number key.
  2. While playing, press and hold a number key to select a step.
  3. Press “BPM/M” to insert a re-trig (flam) on that step.
  4. Press “BPM/M” multiple times to switch between the number of re-trigs.

When I press and hold a number during playback and press “M” for a flam then I do not see “t-4” etc. Only the shirt-buttun icon appears (every time that step is played).