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I'm no expert in debian packaging management so what I'm going to suggest might be outrageously wrong and still going with it without fully understanding their effect may break your whole system, so take that with extra precaution and do read the man(ual) pages first :)

So, if you're sure that liblo0ldbl is what it says, my suggestion goes like installing the qtractor.deb with the mighty force option, i.e., use:

HTH
Cheers