Uncle Dave is correct, SLM meant Saint Louis Music and they didn't make anything. They just put their brand name on stuff other manufactures made. I have an old set of SLM bass pedals. I used them for 15 years. The SLM pedals were self contained with their own tone generator. They are no longer available and as far as I know parts aren't available either. I don't know of anybody that currently makes a similar product. I now use the Roland PK-5 midi pedals. They plug right into my Ketron X-1 and they let me play my X-1 just like a two manual organ with bass pedals. They have no tone generator built into them. If I couldn't use my X-1 as the tone generator I would use my Peavey Spectrum Midi Bass module for the sounds. The bass pedal issue has been a major factor for me keeping my X-1. As far as I know the PK-5s can't be played in this manner on any other product except the Ketrons.
Tom
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Thanks,
Tom