Lights out 2 audioz8/10/2023 ![]() It also helps to have a headset with mic plugged into the headphone jack at the same time. ' to record the I2S audio coming into the RPi and send it back via I2S to the Fe-Pi and connect an amplified speaker to line out to hear what is coming out. Their main suggestion is to use the output of a smartphone and a cable with 3.5mm plugs to drive line in, run a linux command 'arecord. The author didn't totally understand what was going on (and seems to have not read the NXP datasheet) but overall provided the right kind of info at the right level, IMO. This is the level of information I would hope the vendor would provide. This page went through a lot of very helpful suggestions on how to configure and troubleshoot this device. ![]() If you want that tool you need to do "sudo apt install -y pimixer". The vendor's page says "You may also use the mixer provided with Raspbian" but I think you will find this is no longer included with Raspian, all you get is the simple controls at the upper right hand side of the screen. Once you read it, you can kind of piece together what all the controls are and what they influence. It has a good textual description of what these things do. It has a good diagram showing all the flows in to and out of the main audio switch and the various muxes and amplifiers outside of the audio switch. You really need to go to the NXP web site and download the datasheet ( ) and read it. ![]() The vendor's doc has a screenshot and says "See the alsamixer Linux man page for more detail on how to use alsamixer." True, but that's not enough info! The real issue was a lack of documentation describing how the device worked and how to use it. The suggestion that an up to date kernel with a certain patch was correct, use 'sudo rpi-update' to get it. The steps needed to get Linux to recognize the device were correct. I went to the documentation at the vendor's site.
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