Frank Barknecht wrote: > Why have an endless knob at all if it has ends and thus is not an > endless knob? You could just as well use the standard knobs which > stop physically at both ends or use a slider. A real rotary pot (or slider for that matter) cannot be synchronised to software automation without the addition of motors - which costs ???. A rotary encoder (such as is mass produced for CE equipment) is comparatively cheap: with the addition of software such a rotary encoder can synchronise to an external device (in this case PD or a DAW) without the need to adjust the physical fader/knob position. If you wanted to use sliders/knobs with end-stops, you'd need a procedure in which the user wiggles the control until it matches the external device or (as I have seen) coloured lights to tell you how to move the control to achive synchronisation. Some manufacturers have decided that this isn't a nice interface. HTH Rob