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You will need a Raspberry Pi 4B, a Class Compliant USB sound card, a microphone, headphones and cables.
Version 4B is recommended, the 3B+ may work but has significantly lower performance. 2GB of RAM and a 16GB SD card are sufficient. Raspberry Pi 5 is not supported yet (work in progress).
A complete set with passive cooling is recommended, e.g. from this seller:
A micro-SD card is also needed:
You may also ask your local electronics shop.
Most Class Compliant USB audio interfaces should work. See also Soundcards for a list of tested sound cards and their hardware delays.
One of the best cards in terms of delay is
Also the version with two microphone inputs works well:
When using the 4i4 you will need an external power supply, because the Raspberry Pi USB power does not provide sufficiently high current.
A cheaper solution (more noise, less robust):
The best headphones depend on the instrument and genre you play. We prefer open headphones, e.g.,
The price of microphones is mostly determined by the manufacturing quality. Cheap microphones are often more sensitive to faulty phantom power, electrical noise sources (e.g., cell phones) or bad cables. However, cheap microphones may be sufficient for a good ovbox experience. Some options are:
Or any other, depending on your taste and budget.
Please do not forget to buy a cable and a microphone stand. Often microphones are offered in a bundle.
The microphone which is part of the Focusrite Scarlett bundles sometimes produces a loud hum due to bad shielding, especially after mounting and dismounting it from a stand. If that happens you need to firmly tighten the thread at the bottom of the microphone.
Documentation and images CC BY-SA 4.0.