reaper doesn't already do what you need it to do? what would be the purpose of the usb mixer?
play music!
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2014 Martin 00015M
2009 Martin 0015M
2008 Martin HD28
2007 Martin 000-18GE
2006 Taylor 712
2006 Fender Parlor GDP100
1978 Fender F65
1968 Gibson B25-12N
Various Electrics
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