Rein, I am totally baffled! Here are the results of my findings, when using the 2.0.13, as soon as I press the dsp tap the computer locks up and I cannot take a reading of the cpu % Linux 3.2.0-24-generic-pae (ubuntu) 06/08/2012 _i686_ (2 CPU) 1.5.9 + fldigi 06:40:18 AM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle 06:40:18 AM all 14.48 2.07 9.43 38.18 0.01 0.33 0.00 0.00 35.50 no programs running 06:21:09 AM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle 06:21:09 AM all 25.19 1.28 11.01 4.50 0.01 0.08 0.00 0.00 57.93 2.0.13 06:48:42 AM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle 06:48:42 AM all 16.15 0.56 7.11 16.18 0.01 0.17 0.00 0.00 59.83