RR 23 Ladder filter


In the previous patch we didn’t use any of Thor’s sound shaping features. This time we’ll apply our knowledge of an automatic inversable envelope combined with inversed polarity mixing to the filters of Thor itself.

Instead of using an ECF to filter the audio signal we use the new Thor filters. To understand the next patch it’s crucial you have at least a basic grasp of the HighLow_ECF.cmb patch.

As you can see, the only difference with the patch HighLow_ECF.cmb is the absence of the ECF and Filter Slot 3 on Thor now has a Low Pass Ladder Filter. This is because we use Thor not only to inverse the polarity of the audio, but also as a Filter in itself.

We’ll toggle the rack to have a look at the routing. Like the patch HighLow_ECF.cmb the audio is routed through Thor. This time the CV signal for the automatic envelope is routed to Modulation Input CV1.

Now back to the front panel. Again, rows 3 and 4 of the Modulation Bus allow Button1 of Thor to enable the pass through of the inversed audio.

When we look at row 1 we see Audio In1 as Source1 with Destination1 Filt3 L.In with Amount1 of 100. So the left input of Thor is also routed to the left input of the Ladder Filter. In row 2 of the Modulation Bus we route the right input of Thor into the right input of the Ladder Filter.

In row 5 we route the incoming CV signal of the automatic envelope to the Frequency of the Ladder Filter.

Again this patch is easily controlled using the Combinator. Rotary4 controls the mode of the Ladder Filter and Button4 switches self-oscillation on. Button1 enables the inversed polarity and thereby toggles between a Low and a High Pass Filter.

Unfortunately the Drive for the Ladder filter cannot be controlled. Drive needs to stay at 80 exactly so the level of the inversed original and the altered original stay the same.