No ALT/submix output, but these mixers have metal cases and are tiny and inexpensive, so 2 may work. The Rolls are reliable, in my experience.
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4 stereo inputs (1/4" jacks), 1 XLR mic input: Rolls MX122. Amazon US Link.
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3 stereo inputs (RCA jacks), 1 XLR mic input: Rolls MX51s. Amazon US Link.
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3 stereo inputs (1/4" jacks): Rolls MX28. Amazon US Link.
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8 mono/stereo inputs (1/4" jacks): Moukey MAMX3 $40.88, uses a micro-USB cable for power. Amazon US Link.
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4 mono/stereo inputs (1/4" jacks): Moukey MAMX1 $24.88, uses a micro-USB cable for power. Amazon US Link.
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4 Stereo inputs (2 are switchable to mono, 2 have ground-lifts; 1/4" jacks): Donner DEL-8i2 $28.89 with current 15% coupon. Amazon US Link.
- Others: Eventide MixingLink, Radial Key-Largo, Shure SCM262/268,
- Budget: Edirol M-10MX, Behringer Xenyx 1002B, Rockville LINE8, Nady MM-242,