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 SEMstick by KBplugs is a Virtual Instrument Audio Plugin. It functions as a VST Plugin.
Product SEMstick
Developer KBplugs
Price (MSRP) Free
Type / Tags
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
 1.0  Downloads Released
Miscellaneous Information
Copy ProtectionNone
Other / Unknown
Max. 6 items
Latest Version Changes [view all]

An emulation of the features and structure of an Oberheim Synthesizer Expander Module, coupled with a CATstick joystick controller (here implemented as an X/Y pad). The CATstick also contained two additional LFOs.

Since the original SEM had so few CV inputs that aspect of the emulation has been cheated to allow the stick to control any combination of: either or both VCOs, VCF and VCA.

Clicking on the panel's 'Notes' button will display helpful info.

Many, many thanks to 'bbuese' on the DSPR forum for designing the 'spring-action' for the stick - unlike typical X/Y pads, the CATstick returned to the center/zero-output position when it was released. Here one has the option of spring-loaded 'stick' or normal X/Y pad operation.

This does NOT emulate or model the actual sound of a SEM, or any other vintage hardware synth, just borrows from the control design, layout and panel design of the SEM and the CATstick.


32-bit, so will require jBridge, etc., (or a DAW that will bridge) for use on 64-bit systems.

The link on the website is to a Sync.com folder that also contains the .osm Synthmaker source 'schematics', so anyone with SM, or it's successor Flowstone, can alter it to suit. It's hoped that anyone who makes significant improvements will share the result with everyone.

As this was originally built for my own use only, there are no presets included; I wanted to come at the instrument anew each time, as one did with vintage analog hardware.

Made with SynthMaker

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