A multi-octave, wideband voltage controlled oscillator has a plurality of high impedance current output individual voltage controlled oscillators coupled in parallel to form a bank of voltage controlled oscillators covering at least one high frequency octave. Certain embodiments relate to whitewater recovery processes in which ion exchange is used to remove dissolved ions from the whitewater, which can reduce the degree to which chemical additives are used in the process. In another embodiment, a stealth delivery mode is provided in which an IM message is displayed to the receiving user only if the receiving user has approved the display of the IM message.