Hi. My Name is Jürgen. I am new to this board (hello everyone) but I am not new to electronics. I am bulding two SIDs , one with Mike and one with Smash TVs PCBs (KITs). The Set from Mike is working 100%. The Core Modul from Smash TV is also working 100%. But the SID Module from Smash doen´t make any sound (except some noise). As I have a working set of the SID so I can say, the SID itself is working (midi & software too), and the Mike SID Module works with Smash Core , Mike SID with Mike Core , but the Smash SID Module with none of the Core Modules. I change the 2 ICs (545?) with working ones , I have the right parts , soldered well. I noticed that MD on Core is SC on SID. I checked this by measuring from Core IC to SID IC. All wire seems to be correct and working. With an oscilloscope I see that clock arrives but the audio out has just DC voltage but no audio. Voltages are correct... What can I do next? Cheers Jürgen