MOTM

What are the 3 DIY FPs in the middle row on the right?

http://home.freeuk.net/bandpass/bigsynth1.jpg

Thanks!
Shemp

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Tentochi writes:
>>What are the 3 DIY FPs in the middle row on the right?
http://home.freeuk.net/bandpass/bigsynth1.jpg<<

My question is what manufacturer makes those small black Doepfer sized modules 
in the upper right of the picture? Or are they DIY?

-Elhardt