Hi Ingo,

a CV input sounds comprehensible to me. I just thought to omit it to
keep it simple and cheap but if it is needed it is needed.
Price is not everything. ;)

The 48 db filter is more important to me than the simple highpass.

Cheers
Joachim



Am 15.12.2010 22:25, schrieb selfoscillate:

>
> hello joachim,
>
>
>> I would like to share two module suggestion that came to my mind
>> while patching:
>>
>> 1. A simple and cheap dual 48 db filter to use with the BBD modules.
>> Only 2 jacks (in/out) and 1 potentiometer (frequency) per filter.
>
> in principle a good idea, but i'm not sure if it would be
> really satisfying for using it with a bbd, at least for me.
> without a cv input the filter cannot follow the clock of the bbd,
> which means that you need to close the filter more than necessary,
> when the delay time is modulated. the a188 has a cv output for
> controlling a vcf, so you can dial in just as much filtering as
> necessary, which is a great feature imho. this is of course not
> valid if the delay time is not modulated, but isn't that a big
> part of the fun on bbd delays often i also add a slight portion
> of resonance on the vcf to emphasize the higher frequencies,
> which reduces the dulling effect even more. i always use
> the a108 for that, but somehow it is a bit of an overkill,
> especially when you want to filter before and after the bbd
> and therefore need two of them. so to make it cheaper without
> omiting the useful things, i would prefer a very steep
> dual vcf with reduced functions. only one cv input per channel
> instead of 3, no resonance insert, no attenuators for the
> audio input and a more neutral sounding and simpler filter
> circuit (no need for selected transistor ladder stuff here).
> it should have 48db steepness, or even 60db if possible.
> i want such a module since the a188 is available and i would
> buy it instantly. there was a switched capacitor dual filter in
> the planning stage some years ago, for exactly this purpose,
> but i believe that technical issues delayed the development
> and i don't know if this project is still alive.
>
>> 2. A simple and cheap (maybe passive) Hipass filter (80 Hz), maybe also
>> dual:
>> 2 jacks (in/out) + bypass switch.
>> Useful for modules which generate too much low end signals.
>> If it would be active and dual, one 80 Hz and one 40 Hz filter would
>> make sense in my eyes. The latter could then be used for basses and
>> bassdrums and cut those frequencies that almost no loudspeaker can
>> handle and thus increase the headroom and help reduce some nasty
>> unwanted distortion effects.
>
> a passive dual highpass filter is not a bad idea,
> i just don't know how many people would buy it,
> as it is a very simple circuit.
> maybe you should start a poll
>
> best wishes
>
> ingo
>
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>
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