![](https://www.flitemedia.com/wp-content/uploads/2007/01/simmons-sds9-282x250.jpg)
My friend has had his Simmons SDS9 for years but we had never fully worked out the MIDI functions due to not having a complete manual. Now, thanks to a member of the vintage-synth forums, we have a complete english version of the full user manual and I’ve put it on here for anyone to download:
(Image courtesy of Ryan Smith)