By pausing audio during flash writes, the worst screeching of #8121 is avoided. I don't consider this a full fix, but it greatly improves the by far most common scenario in which the problem occurs. Tested on rp2040 prop feather with a midi synth playing arpeggios. When writing to the flash e.g., with ``` dd bs=512 count=32 if=/dev/zero of=/media/jepler/CIRCUITPY/boop ``` the audio goes "tap tap tap tap" during the flash write instead of the squawking. This isn't a 100% fix; it will still glitch out, including during USB enumeration which must be taking a long time without servicing background tasks. Add a delay if not usb-connected at startup ameliorates this greatly.
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