Moog Ladder Filter

[Creativemind]

Hi All!

Was just looking at Robert Moogs Ladder Filter. It's a Low Pass and High Pass filter in one. It got me thinking, I wonder why the Props never made a High Pass Ladder Filter for Thor or combined the Low Pass and High Pass Ladder Filters together with a switch like on Bob Moogs Ladder Filter.

I notice his filter has Attack and Release and an envelope follower too. That seems very interesting.

I suppose at the end of the day, it's not a direct emulation of Moogs classic Ladder filter but just a thought. Here's a video explaining how the Moog Ladder Filter works:-

Discovered something new from that video about Resonance. Resonance boosts the frequencies around the cutoff. I didn't know the technical aspects of what resonance did, just knew it made the sound more whistley.

Thanks!

[Loque]

What about this one?
https://shop.propellerheads.se/product/ ... de-filter/

[selig]

Resonance is feedback - took me a while to figure that one out. It is literally feeding the output of the filter back into the input, and since the filter is tuned to a specific frequency (by design) it will emphasize that frequency (the control is also sometimes called "emphasis" on older synths such as Moog).

Here's a quick way to turn a low pass into a high pass. If you change filter types or add resonance the 'effect' will lessen, as the cancellation needs to be tuned differently for each setting. Notice I have offset the "Drive" control on the Ladder Filter down to "56" to get better HP response. For Ladder Type II you will need to set Drive to "62" for optimal results. Button 1 on Thor switches from LPF to HPF.
https://dl.dropboxusercontent.com/u/147 ... r.thor.zip

[Creativemind]

Sorry Selig, and you wire this up on the back to a Subtractor or other Thor or?

[Creativemind]

What about this one?
https://shop.propellerheads.se/product/ ... de-filter/

That's a nice lookin' Re man. Would like to know how it fairs against the Moog one though.

[Loque]

What about this one?
https://shop.propellerheads.se/product/ ... de-filter/

That's a nice lookin' Re man. Would like to know how it fairs against the Moog one though.

Try it... Note, that there is a filter bundle available...

[Creativemind]

I wouldn't know though lol!

[selig]

Sorry Selig, and you wire this up on the back to a Subtractor or other Thor or?

Sorry, didn't explain it! This patch makes Thor act like a stand alone filter unit instead of a synth. Use input 1/2 and the main outputs 1/2 for your I/O hookups. It's more to let you hear what a High Pass Ladder filter sounds like than as a real substitute for any existing product.

[EdGrip]

+ 1 for the Primal Audio filter REs. PMS-20 in particular is stonking.