For my electrical engineering capstone project. We're testing an ultrasound positioning system using six cheap electret microphones and a simple biasing/power circuit - the whole system will eventually be implemented on some sort of microcontroller. But, in the meantime, we need some way to have at least four, preferably six analog audio inputs to a PC for testing our algorithms in MATLAB. 192kHz sampling of all inputs would be best (for good ultrasound reproduction). Does anyone have a solution? We can spend up to $300ish, less is better. We will not be using XLR cables but regular 3.5mm jacks. Thanks!