I would wish a GPIO Connection to RaspberryPi Computers (or maybe Integration of a Pi Zero into the Amplifier). Many cool things would be possible with the Integration of a popular Microcomputer into the board.
I know Up2Stream i9s programmable as well, but the Raspberry is around in the Millions, and many cool sound Projects would be possible with a popular and common platform
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I am pretty sure I read a post on the forum where the Arylic GPIO is configurable using the ACP Workbench so maybe search around on the forum.
I am interested to know what Functionality you are thinking of that would be assisted with GPIO on RPI ? I have a lot of experience with RPI so I am interested to know what youe ideas are for applications 
Kind Regards, Kevin
Basically to add a Microcomputer to use the DAC of the V4 and get Power from it over GPIO directly
Are you from the Arylic Team?
If you are from the Arylic team, I have some Issues to report:
- I discovered that the USB Interface(the regular, not the Micro-USB) of the Up2Stream is not powered off when you turn off the Amplifier. That means, any device connected to that Port is still under Power
-It would be nice to have a “Shutdown” Button in the App
-Would be nice if the Bluetooth could send to Wireless Speakers also with bluetooth (Airport not possible;proprietary Apple stuff)
It is. I have to figure out how to use this.
Based on how I typically use the V3 I’d like the V4 to have:
- A onboard DC-DC converter that allows it to be used with a wide 18-75V DC input range (e.g. TMR-4-4811).
- Default to the higher quality ES9023P for analogue audio output.
- All the pins to be available via standard Molex KK header (analogue audio, IIS, power, WPS/reset etc).
Thanks.