Allen & Heath ZEDi-10FX Compact Hybrid Mixer/USB Interface (with On-Board Effects Engine)

Yes, there is no trim control for the ST2 input on the Allen & Heath ZEDi-10FX Compact Hybrid Mixer/USB Interface (with On-Board Effects Engine).

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First, let's make clear that headphone signal is line level and headphone outputs typically use a stereo connector. The aux output on the Allen & Heath ZEDi-10FX is sending a mono line level output signal via a 1/4" TS (mono) jack, so that is why you only hear audio through the left side of your headphones when you connect the stereo plug to the mono output. The Hosa Technology GPP290 Monaural Male 1/4" Phone to Stereo Female 1/4" Phone Adapter (B&H # HOAPMSPF) will convert the stereo plug on your headphones to mono and that will allow you to hear mono audio through both sides of you headphones (same audio through both sides) when you connect the stereo headphones to the mixer's mono aux output. If you need to connect two sets of stereo headphones to the ZEDi-10FX, a better option would be to use a stereo splitter connected to the mixer's headphone output. The Hosa Technology 1/4" Male to Two 1/4" Female Y-Cable (B&H # HOYCSPM2SPF) will allow you to connect two sets of stereo headphones without sacrificing tone, volume or stereo separation. If you need to accommodate more than two sets of headphones, the best option is to use a separate headphone amplifier connected to the mixer's headphone jack. The Polsen HMA-41 4-Channel Stereo Headphone Amplifier (B&H # POHMA41) or the Mackie HM-4 4-Way Headphones Amplifier (B&H # MAHM4) are good options for this purpose. The headphone amplifier will give each user their own headphone jack as well as an individual volume control to set the volume level for their headphones fas desired.

Unfortunately this is not a supported function. If you were to plug a USB microphone directly into the USB port of the ZEDi-10FX, there would be no drivers available for either unit to function properly. Even though some USB devices can be plugged into some computers and function without any additional driver installations (typically computer's running macOS), the USB devices are still utilizing the computer's core audio drivers.

The ZED 10 and the entire ZEDi series will accept 110 to 220 volts. You will need to change the shpe of the plug as it would come wth the US version.

Unfortunately the ZED-10FX isn't capable of receiving or transmitting MIDI information.  The USB interface on the console can only be used to record or playback up to 4 channels of audio. If your keyboard does produce audio, then yes, you could use one of the stereo 1/4" inputs on the console to record that audio signal via USB.

I am the person who asked the question. Here is the answer. You can do it but you lose two inputs. The iPhone camera automatically uses channels M1-M2 as it's audio inputs. In order to get the other inputs and fx into the camera audio, you have to patch the output of your mixer (the monitor outs worked for me) to the line in of M1 M2. That means you can't use them for microphone inputs. That is fine for my setup. If you are using phantom power, routing to the xlr in of M1 M2 could damage your unit. Anyway, it works. I can stream M3-M4-ST1 and ST2 directly to my iPhone 6s with FX. Well, no effects on ST2, but I mainly need the FX on my two mic inputs.