Olin, > > Providing the scanning is carried out quickly enough (likely to be > interrupt > > driven via a timer) I am assuming that I can include the encoder outputs > in > > the same matrix as the keys. > > That depends on the fastest realisting pulse rate from the rotary encoders > and how fast you can scan all the inputs. The other thing to consider is > that when a user is rapidly turning a knob, they probably don't care and > won't notice a little slippage. Unless the knob itself is calibrated with > indicators nobody will know. Very true, and since the knobs will be as large as I reasonably can get away with, that should slow them down a bit. Whatever you believe to be reasonable someone is bound to see how fast they can rotate the knob. Knowing my luck they will probably try using an electric drill! David -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics