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

Andrew Simper andy at cytomic.com
Fri Aug 4 16:27:12 CEST 2017


"Hello Andrew,
Yes, the 500 Ladder Filter high-pass is created in a similar way to the
Voyager or Mother-32 high pass, not like the 904B.
Thank you, NOAH JOLLY SERVICE DEPARTMENT TECHNICIAN"

Well there we have it.

Cheers,

Andy

On 4 August 2017 at 17:57, Andrew Simper <andy at cytomic.com> wrote:

> 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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>>
>
>
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