Help Needed with filer board smr 4 mkii ver3 12v

Hello Community,
I have my shruthi made, it seems that it works ok but I can´t get the right filter cutoff, I can hear the filter action but it does not cut all the audio. Also sounds like a bit overdrived, I double check everything, I also tried different filter software but I can´t find the solution. Im using 12v 1A as PSU. Any help here?
Thanks