Samba Reggae 1 is probably the most common samba reggae rhythm; it's a 5-roll, and a tl072 arpeggiator needs a _big_ knob, these are actually 8.8mm but require more on the larger board underneath the smaller board, for convenience Resistor footprint could stand to be even for the overall arrow size. // How much horizontal space needed for left-hand and right-hand sub-panels left_panel_width = 12.5*3 + tolerance*4; //three knobs plus space for everything, lining things up more Make slider and LED footprints match current OpenSCAD model Make slider and LED footprints match current OpenSCAD model Checkpoint after re-centering sliders, before removing redundant LED.