[sdiy] HP from LP ? -> Mother-32

[Andrew Simper]

I've emailed Moog asking if the Moog "The Ladder" 500 series module has a
true -24 dB / Oct high pass filter in it, and not just the input subtracted
method of their other stuff, will let everyone know what the answer is.

There is a tell tail sign that this too will just be the input subtracted
from the output in the manual talking about the 2 pole / 4 pole switch :
"In HIGHPASS mode the filter slope is reversed" - which is still not
telling the truth of the situation. I think they just take away the input
from either the second ( 2  pole) or last (4 pole) output if the high pass
option is enabled, neither of which are very good responses, and they just
hope no one will notice and keep quiet about it and post no frequency
response  charts.

Cheers,

Andy

On 4 August 2017 at 16:46, Michael Zacherl <sdiy-mz01 at blauwurf.info> wrote:

>
> On 4.Aug 2017, at 7:14 , Andrew Simper <andy at cytomic.com> wrote:
>
> > PS: I don't know for sure that the Moog Ladder 500 series actually does
> do a resonant high pass, so it would be great for someone to confirm this,
> and also if the 12 / 24 dB selector works in HP mode.
> >
>
> hm .. virtually no official information about that: even in the manual
> it’s just
> “For true HIGHPASS or LOWPASS, make sure the RESONANCE is at zero.”
>
> https://www.moogmusic.com/sites/default/files/Ladder_Manual.pdf
> http://www.soundonsound.com/reviews/moog-ladder
>
>
> I don’t have a 904B at hand but just for fun I dared to try the Arturia
> Modular emulation.
> Patching a feedback on the 904B there results in a very vocal type sound
> when sweeping the frequency.
> The useable feedback range itself is very narrow, the VCFs frequency range
> seems odd too, even without feedback.
> But since it’s software it could be virtually anything. ;)
>
>
>
> --
> http://mz.klingt.org
>
>
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