smmixer(8) on Linux
The text bdfd9249068f, as Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge), Debian 3.0 (Woody), Debian 2.2 (Potato), Debian 2.1 (Slink) shipped it.
get/set Linux soundcard packet radio modem driver mixer
Flags it lists
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-i