IC Datasheets

Here are some rare datasheets of mostly obsolete ICs used in comercial and DIY synths:
 

SSM2024 by AD                Quad linear VCA
SSM2024 by PMI              Quad linear VCA
SSM2033                          Complete VCO, used in Korg Mono/Poly
SSM2040                          The most famous VCF chip, fantastic sound
SSM2056                          VC Envelope generator
SSM2210 by AD                Matched dual NPN
SSM2210 by PMI               Matched dual NPN
SSM2220 by AD                Matched dual PNP

BA6110    by ROHM           BA662's successor, discontinued recently