Thanks for the link to the manual. Be sure to read page 11, which explains the inputs a little better.
Quote:
Primarily, the 3-contact,
XLR-type connectors are for connection to
balanced microphones, and the 1/4" jacks
are for line-level, unbalanced signal sources
(such as electronic instruments).
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Based on this description, you will need XLR to 1/4 cables in order to run the Main outs of the 11R into the line inputs of the PortaStudio.
It really doesn't have anything to do with the unit using tape. The line inputs are properly padded to accept the hotter signal; the 11R in this case.