Do not use a TBC-1000 to process audio. It is unnecessary, and potentially degrades your audio quality. Bypass it, go directly from VCR to capture card. The delay of the TBC video (video:audio ratio) is 1 frame, 1/60th sec, about 17ms, negligible.
All TBC-1000s and VP299s (distribution amp, distro amp) are having caps issues now. Your VP299 board in the 1000 is surely bad. It happens, often.
Repairs will probably be a few hundred. Lots of caps to fix, lots of time involved.
Forum member Diopter_Doctor recently said he is fixing these:
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http://www.digitalfaq.com/forum/memb...er_doctor.html
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http://www.digitalfaq.com/forum/vide...html#post85015 (post #19)