[sdiy] Delays and companders

Roman Sowa modular at go2.pl
Tue Mar 5 14:21:43 CET 2019

Make the delay with ADC/DAC and memory, and just add one short BBD "for 
that vintag sound". Then put BBD chip under clear window in the case and 
light it up with LED so everyone can see it has BBDs so it must sound great!


W dniu 2019-03-04 o 22:25, Tim Ressel pisze:
> This is a bit ironic. My goal on this project is to see just how clean I 
> can make a BBD delay. In doing so I may wind up nuking "that BBD sound" 
> people fawn over. Eh, so be it. I'm on a mission here.
> --Tim (Engineer Templar) Ressel
> On 3/4/2019 1:16 PM, Ben Bradley wrote:
>> You're obviously making a little fun of this, but it's remarkable how
>> much we use specific things (even specific part numbers for BBDs)
>> because of "the sound" they give.
>> I had a Minimoog decades ago. I had read an article in Keyboard
>> Magazine that the filter input starts to distort if you turn an
>> oscillator's mixer level past 8, so I always kept it at 8 rather than
>> going to 10. But (what seemed unrelated at the time) I didn't feel I
>> was satisfied with the sounds I got out of the thing.
>> I've experienced and heard of lots of examples of this, some more
>> subtle than others. I recently heard of "real" Hammond player coming
>> in to a showroom, playing the modern Hammond/Suzuki keyboards with
>> electronically generated tones, and after a couple minutes saying "the
>> sound just isn't there" compared to the old Hammonds with the original
>> mechanical tonewheel generators.
>> On Mon, Mar 4, 2019 at 3:55 PM Richie Burnett
>> <rburnett at richieburnett.co.uk> wrote:
>>>> From: Ben Bradley
>>>> Perhaps better is using a small microcontroller with built-in A-D and
>>>> D-A  to delay the VCA control voltage. The controller's clock can be
>>>> derived from the same clock as the BBD, so they would stay in sync
>>>> over various delay times.
>>> Or just add some external RAM, then delay the audio digitally and enjoy
>>> lower distortion and a lower noise floor ;-)
>>> -Richie.
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