SCMODE is a command line utility to set your Roland Sound Canvas series
tone module to either GS Standard mode or MT-32 emulation mode. It is
suitable for use in batch files, ie. when starting games configured for the
MT-32, or resetting to GS mode before starting a sequencer.
SCMODE has been confirmed to work correctly with the SC-55, SCC-1, and SC-155 tone modules. I have not been able to test it on a JV-series keyboard, but there's a fairly good chance it will work with those too.