Wow…16gb Pi5 just announced! Might be time for an upgrade to my setup!
https://www.raspberrypi.com/news/16gb-raspberry-pi-5-on-sale-now-at-120/
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Pi 5 is a big step in performance on its own (assuming you get the active cooler too). The amount of RAM necessary depends a lot on what the use cases for the Raspberry Pi is going to be. Usually 4GB or even 2GB of RAM is sufficient for most audio purposes. 