On 05/11/2008, at 16.02, HOSHUYAMA wrote: > Noise generator in Boss DR-55 may be what you are looking for. > > The schematic of the noise generator part and some discussion in > Japanese > are at: > > http://www.rjblog.net/archives/2005/e000131.php Pardon my ignorance, but, referring to that diagram, what is Q1 and Q2? Best, Steffen