mk1
Same as me then, have you tried it on a completely fresh pattern and kit? Change nothing but the following:
Add trigs on Steps 1 and 2
Arp page: set Mode to Up
Note page: set Len to 16
Plock LFO 1 trig on Step 1 to On
Plock LFO 1 trig on Step 2 to Off
Filter page: set Freq1 to 70
LFO1 page: set Spd 8 (or lower), Saw Wave, Dep1 70
You should hear the filter frequency start high and sweep down across the bar, resetting on step 1.