Not going to find a 12. Way too much for a USB 2.0. I have a Alesis Multimix 16 USB 2.0 multitrack. 8 XLR + 4 stereo paired 1/4" inputs. Technically you could input 12, 8 mono XLR and 4 stereo or mono 1/4". Never tried it but you could piggyback two mixers; separate drum mixer, input that into one channel of the main mixer, output to USB.