Hi  I am trying to build a SIDv2,  actually a TWINSID from yodabe. I have build only a main board for now, and the sid worked, when I tried the sid tomorrow there was no sound. So I have tried the testtone app to find out Is there a problem with the output amp. I have connected the 8 pin and the 27 pin and there is no sound but when i touch the wire with my hand there is a sound, What? Strange. Can someone give me an advice what to do, what to replace, what to check?