implement scaling frequency with debuging, stuck at segfault

Please try to track down the segfaults. At the moment the CTRL(SHIFT) LEFT and RIGHT should only alter variables lfreq and ufreq. Since I am new to this project, I don't know what could cause this. Can you replicate the segfaults when testing with an audio file and doing lots of CTRL(SHIFT) LEFT and RIGHT?

Also spek.pot file is included in this pull request. Not sure what to do with it. Perhaps make the .gitignore settings handle this.