Again I've found a very strange issue with the clickless SW Slew - Growable Single Vl Ctrl block. The schematic is attached, I'm using ADAU1445. The level is set to zero at the compiling time, so once the program and parameter are loaded, I suppose I could see the input signal coming out of the output ports, but I couldn't see any thing coming out. With the same schematic except the vol ctr being replaced with No Slew (standard) version, everyting just works fine. Is there anything special I need to do to use the clickless SW Slew volume control? Thanks.