Found this listing for the volume/squelch/power control used in millions of mobile radios. Same one used as echo volume/speed.
https://www.aliexpress.us/item/3256...0MTYwNzckbzMkZzAkdDE3ODY0MTYwNzckajYwJGwwJGgw
Found edgewise mobile-radio S-meters there, too.
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https://www.aliexpress.us/item/3256...0MTYwNzckbzMkZzAkdDE3ODY0MTYwNzckajYwJGwwJGgw
Found edgewise mobile-radio S-meters there, too.
73