problem with external sampling

just configured my mpc with pc, eveything seems to be working ok,
exept volume and rec volume - no respond from theese knobs.

and when i`m turnig into sampling mode - the mpc doesnt see the sound
(i have tried sampling from the same source with my other mpc 2000xl - it OK).

resampling on my new mpc works fine, just doesnt see sound from external source.

what could be the couse?
please help
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