Hello, I've just purchased a Model 12 to set it up for my electronic synths setup. However, once I did this, I immediately noticed a hiss noise in the Main output. At first I thought the Volca's were noisy and that might be causing it, but after disconnecting everything from the inputs I could still hear the same hiss noise. So, to be more detailed, I turn the main channel fader to 0 db or lower, I switch the channels to send input to Main by pressing the Main button next to them and then I turn up the volume for each channel (gain at 0db or lower, even turn all the way down), then I start hearing the noise gradually as I raise the volume for the channel. If i do the same for the next channel, the noise gets doubled and so on. It happens on the speakers and in the headphones, as well. Also, only when the input is set to live. To be completely sure I did all in my power and knowledge, I tested the follwing: 1. Disconnected all synths from the inputs, Phatom power is off and all channels have INSTR off. 2. Changed the power source from a power strip to a power outlet and disconnected the speakers from the outputs, still geting noise in the headphones (probably in the speakers if I connect them). Thought maybe there's something to do with ground noise. 3. Tried to see if it gets better or worse by using any EQ, effects, compressor value, no difference. It gets worse by adjusting the volume to be higher, obviously. 4. Set the channel phase to be inverted, same thing. 5. Ok, now I wanted to see if there's an issue with only the outputs, or it affects recording as well. So, i went ahead and recorded over USB with Audition and Audacity and the hiss is present in the recordings, even if the volume from the Main or the channels is turned all the way down. Basically, every recording has an equal volume hiss no matter what I do. 6. Now, I recorded directly with the Tascam on the SD card, I get the same hiss there as well. The second channel seems to have more noise than the others. I tried finding a solution on the internet, but I haven't found a user experiencing the same issue as I do with this product. Therefore, I might be doing something wrong or the product may be faulty. Can you please help me in solving this issue or if I should go back to the retailer and get it changed? Other equipment: - 2x Balanced male jack to female XLR (gold plated) to connect to the monitors - Ansmann Type-C USB Cable 200 - Alessis Elevate 5 monitor speakers - Senheiser HD-25 headphones - Synths (even though irrelevant as I get the hiss even when nothing is connected): Volca beats/keys/FM, Elektron Digitakt - Power strip with surge protections and grounded (but also used an outlet directly). Thank you for your help!