The patch-panel editions of the Tom Oberheim SEM use 3.5mm (1/8") jacks for the user patch points. We were able to source 1/4" to 3.5mm cables to allow users of 1/4" synth gear (MOTM. Moog, Synththesizers.com, etc.).They're guaranteed for life and easy on the wallet too. Cables come in packages of four.