I believe dynamic-faust output is tainted LGPL because of the header here:
https://github.com/grame-cncm/faust/blob/master-dev/architecture/faust/dsp/llvm-dsp-adapter.h
That makes any binary compiled with dynamic-faust LGPL/GPL since it is statically compiled as a binary. To my knowledge the only way to rectify is to relicense this file.