Doepfer

Hello all 
I'm relatively new to modular synth so forgive me if I sound stupid haha.
I have been doing the DIY thing for about 4 years with no bad experience until the other day. I was building a vco from a schematic I found online, I already have one that works fine along with my wasp filter A-124. I did something bad and now the wasp does not work properly. All of the jacks work except for the audio in I'm just wondering if anyone else has had a similar problem. I'm going to fix the it I just don't know where to start. Any advise would be awesome!

Thanks, Jack