I’m having the same problems, upgraded to macOS Sierra weeks ago and also got this:
“LibAudioStream Library Error”
and
“SDIF Library Error”
and further:
"“Loading PortMIDI library: /usr/bin/libportmidi.dylib”
“Library PortMIDI not found!! [/usr/bin/libportmidi.dylib]”
Error: Segmentation violation(11) [code 0] at 7FFFABD16B5D
Foreign code offset #x1D from symbol “objc_msgSend”
module “/usr/lib/libobjc.A.dylib” [ #x7FFFABD10000 ]
rax 0 ; rbx 6000001C3ED0 ; rcx 705 ; rdx 0 ; rdx/Users/xy/Library/Preferences/OpenMusic/6.10.1/OMPrefs.lisp
0
rsp 7FFF5FBFBBF8 ; rbp 7FFF5FBFBD20 ; rdi 6080001E4C00 ; rsi 7FFF95CA119C
r8 B0 ; r9 6000001411E0 ; r10 40DEDEADBEA8 ; r11 7FFF95CA119C
r12 7FFF95C9A7A8 ; r13 7FFFB525D108 ; r14 30 ; r15 7FFFABD16B40
1 (abort) Return to Cocoa Event Loop
Type :b for backtrace or :c to proceed.
Type :bug-form “” for a bug report template or :? for other options.
CL-USER 1 : 1 > "
Manually linking the dylibs did not help either.