And one more question - how can I set frequency, voltage and fan speed for every unit individually? Pi interface only allows to change settings for all units at the same time. If I try to write "--avalon-auto" and/or "--avalon-freq 500,550" (I also tried "--avalon-freq 450-550" and ""--avalon-freq 450-500,450-550") at the "More Options" line in Status->CGminer configuration tab - miners simply don't start mining. Is it impossible with Pi?