On the Roland S-1, you can sequence in 3/4 time by setting Pattern Scale (P.SCL) to sixteenth notes and setting the pattern's last step to match one measure.
- Hold down [SHIFT] and press pad [15] (MENU).
- Turn [TEMPO/VALUE] to select "P.SCL" (Pattern Scale), then press pad [2] (ENTER).
- Turn [TEMPO/VALUE] to select "1_16" (sixteenth note).
- Hold down [SHIFT] and press pad [4] (LAST).
- Turn [TEMPO/VALUE] to set the last step to "12" (3 beats x 4 sixteenth notes = one 3/4 measure).
- Press pad [1] (EXIT) to return to the previous screen.
See "Using the menus" in the S-1 Owner's Manual for other P.SCL values.