For my JTM45 build, I've made both a schedule and a layout in DIYLC. Both are usefull: The schematic gives a nice overview, the layout is needed for building the amp. Getting them the same is quite some work and keeping them the same during changes is difficult (at least for me). Therefore I wrote some software (currently in Octave) to extract a netlist-like file from both the schematic and the layout. This file can than easily be compared using a graphical diff viewer, e.g. meld. There are still some glitches (pot connection numbering is different, tube pin numbering different), but as a proof of principle it is ok. Is this something you guys would want? Are there already any tools available? Any feature ideas? Any comments?