So after comparing different routes including building a inductor based FFB moog clone from J Haibles pcb, i bucked out for now, ordering the B FFB for 102,-eur and want to hack away what i can. Thats fun too.
I want an FFB for the formant Filtering Quality and heavy ringing resonances. Most clones are much too tame for that. Of course feedback to itself is needed but i would like to mess with the parts in the signal part and wonder
1)if anyone have hints about what caps are actually in the tone shaping path here. I am thinking about replacing with some vintage stuff even if its just for the non-linearities.
- i can wire jacks to pots for independent outs of the bands and if there is a way to not have all bands out but lets say odd and even or other groups. Like for example, if i take a jack to the last filter band, will i have another all-out but simply pre HPF?
3)if i would like to add a crossfader like on the AJH model, how would one wire that up exactly?
Here is a pcb shot, besides the smd resistors it looks pretty hackable.
Ultimate goal is shimmering uneven harmonic content by resonance drive for organic shaping of sounds, think formant filtering adding voice like overtones and harmonics.
The pic is from amysynths.co.uk and there is a hint „ One potential modification is to improve the accuracy of the lower filter bands by adding capacitors on the rear of the PCB, but this is not an option for the upper frequency bands.“
I am not sure how to add, if he is talking about parallel, i forgot the tech term but thats a typical EQ thing to add a high quality low value cap to a generic one for filtering