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Multiplexing analog lines over PIC16C745 and then USB

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Is good to know this forum exists.
I need to build a kind of mixer that allows to record 3 or 4 audio voice inputs at the same time. I am using a PIC16C745 with USB, so i can record the digitally converted voice inputs in my computer.
The problem is that i dont know if the PIC16C745 will be capable of recording so many voices at the same time, because this PIC implements the low speed USB standard (not the full or hi speed)., so the throghput maybe is too small.
The voice recordings are very low quality, 8 bit, mono, 5khz more or less.
Could you recommend me a microcontroller with USB that allows me to do this application?? Is it possible with the PIC16C745???
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