Hi,
thank you for your answer. I am feeding it usually with Crumar Mojo, or line output of my Motu audio interface (when I play raw organ from Mainstage), but whatever source I use, and also when nothing is connected to, I am getting that oscillating hi pitch noise, which is not connected to Ventilator rotor noise simulation. On those pictures you can see spikes around 8 kHz and above. It sounds like hi pitched sine oscillator.
I also use original power supply on both units, and I also change it with isolated, transformer based analog power supply, which is used for guitar pedals, to prevent all kinds of noises. The output ia the same.
I also didn't notice it earlier, but my FOH guy call me to hear it on PA from the audience, and, on that amount of power, it oscillate very significant.
If anyone of you would like to try this, I will appreciate. Just two outputs, directly to two line inputs, with little bit more gain, and tell me what you hear, beside "wind noise" from the pedal.
Thank you in advance!