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. Some recent review articles include [448,519]. For sound examples and few other recent developments, see the companion overheads for this appendix [451].