The problem with a fixed filter banks for me is experimenting with
bandwidths. You have to manually adjust each adjacent band carefully
to get the correct effect and that can be cumbersome. I prefer
bandpass filters with resonance controls. I use three A-121 Multimode
filters to not only get fixed resonances but variable ones like
speech.

Another way is to use the A-129 Vocoder to automatically simulate
acoustic instrument resonances. For example, feed a looped violin or
oboe sample from your computer, external synth, A-112, etc. into the
vocoder and to resynthesize the spectral shape.


--- In Doepfer_a100@yahoogroups.com , "lars_arnwald"
<lars.arnwald@...> wrote:

>
> I'm interested in filters creating formants. It's not about human
> voice vowels or the sounds usually produced by by vocoders, but

rather

> the formants associated with certain acoustic instruments, like

cello,

> trumpet, trombone, French horn, etc.
> Probably nothing can beat the Yamaha FS1R when it comes to

parameters

> shaping formants, but like many other digitals it can't process
> external sounds. I've read the specs for Doepfer A-104 Trautonium
> Formant Filter, A-127 VC Resonance Filter, and A-128 Fixed Filter
> Bank, as well as Analogue Systems RS-110 Multimode filter, and RS-

360

> Vocal /Phase Filter Bank. Certain details caught my interest like

the

> input sensitivity with A-104 that easily creates distortion and the
> RS-110 external resonance feedback chain where reverbed signals can

be

> fed back. Some have extensive CV features like A-127, but unless
> programmability is desired, this is not a prerequisite since formats
> have fixed center frequences, bandwidth, etc, AFAIK.
> Unfortunately there are no audio samples for any of the above
> mentioned, so I like to ask if any of the list members have looked
> into/ experimented with instrument formats. Is there any reading to

be

> recommended
> I'm new to this list, but it looks quite promising/Lars
>