This appendix has attempted to trace some of the early technical developments which enabled and shaped virtual acoustic musical instrument technology as addressed in this book, particularly for the case of virtual stringed instruments. For the early period covered (roughly up to the mid 1980s), many lines of developments specifically in the fields of acoustics and musical acoustics per se have been omitted. Moreover, there are quite a few interesting related patents that should be summarized. The author apologizes for all oversights within the limited period and narrow scope addressed. For review articles covering more recent developments, see, e.g., [424,486] (and of course this book). For sound examples and few other recent developments, see the companion overheads for this appendix [428].