I'm planning to add additional internal
memory to the Solton X1. Does anyone know
the SIMM specifications and size that will work. Thanks.

Ron

Ron,
I don't have the specs you need but I will tell you that Solton sells two different boards. One to add additional Pattern Memory and one to add additional sequencer memory. If you need pricing on these boards let me know. I don't have them with me at home.
George Kaye
Kaye's Music Scene