Software complete image for the raspberry pi or you can build software from github
Hardware Installation
Click on the arrows to step through the slideshow below on how to put together a unit:
Instrument connection to Channel 2
Plug in your instrument here.
The Raspberry Pi (with case)
You can see the USB and Ethernet ports on the right side. Power is provided
via a USB-C connector at the left end of the left side.
Size Comparison
The Raspberry Pi is a single board System On A Chip based computer. It hosts the rtjam software that takes
audio from the USB audio device and feeds it over the internet to other players.
Micro SD Card slot
After you burn the image to the SD card, you install it here.
USB Audio Device
A Focusrite Scarlett 2i2 USB audio Device.
Pi with Scarlett
The Pi stacked on the Scarlett (for size comparison)
Pi with Scarlett Backside
You will connect the USB audio device to the Pi with a USB cable.
Pi to USB Audio connection
Pi and Scarlett connected (Note: the Scarlett gets its power from the PI via USB)
Ethernet Connection to Pi
Remember it cannot use WiFi
Ethernet connected to Pi
The other end should be connected to a port on your router
Power Supply for Pi
Pi powered by USB C power adapter. Make sure USB audio and ethernet are connected first!
Connect Headphones to USB Audio
You will need some way to listen to what's happening. Headphones are preferred because they prevent
other players sounds from looping back into the room via your microphone.
Microphone connection to Channel 1
You are going to need a microphone to talk to the other people in the room. If you are doing vocals or
an acoustic instrument then you only need connect one input.
Instrument connection to Channel 2
Plug in your instrument here.
The Raspberry Pi (with case)
You can see the USB and Ethernet ports on the right side. Power is provided
via a USB-C connector at the left end of the left side.
Software Installation
You will need to get the software onto the micro SD card for you Raspberry Pi. Here are the directions for getting the software and buring it onto your micro SD card.
You will need a micro SD card slot on your computer and some software that allows you to burn images onto the card.
Steps:
Download the image from Sofware Image and save it on your computer in a place you can find it later.
If you don't have a good imager, the Raspberry Pi Imager  runs on all platforms and is super easy to use.
After you have burned the image to the SD card, put the card into the raspberry pi. Note: The download image is shrunk to just the size of the data. You SD card is undoubtably bigger than that. After you boot the Pi with the SD card, it will resize that image to the full size of the SD card you have. This cause an extra reboot after the resize. This only happens on the first boot with the SD card.
Here is a slideshow showing the steps with the Raspberry Pi imager
Voila!
Ready to plug in to the Pi.
Raspberry Pi Imager
This is the initial screen when you launch the imager.
Select Custom Image
Use the Operating system pulldown and select "Use Custom".
Select Custom Image (cont)
Navigate to where you saved the downloaded image.
Select SD Card
Make sure the SD card is plugged in. The imager will find it!
Writing the image
progress is shown along the way. Took a few minutes on my computer...
Verifying the image
After the write, software verifies the image.
Voila!
Ready to plug in to the Pi.
Raspberry Pi Imager
This is the initial screen when you launch the imager.
TL;DNR
If you already have a pi or another debian based linux system, you can do your own install from the directions here