Here's the nice bit of simple code based upon an example made back in 2009 by starfiretech. The key adjustments I have made to this code were to check new values against old values, only sending midi data when a change is detected; and the other adding a small delay to remove any slight variations given in value when the pot is not being touched, slightly touched or gets a little knock. Before I added this I was getting some variation (by +/- 1) in value when slightly touched which the delay helps to remove.

int val = 0; //Our initial pot values. We need one for the first value and a second to test if there has been a change made. This needs to be done for all 3 pots.

int lastVal = 0; int val2 = 0; int lastVal2 = 0; int val3 = 0; int lastVal3 = 0; void setup() { Serial.begin(9600); // Set the speed of the midi port to the same as we will be using in the Hairless Midi software } void loop() { val = analogRead(0)/8; // Divide by 8 to get range of 0-127 for midi if (val != lastVal) // If the value does not = the last value the following command is made. This is because the pot has been turned. Otherwise the pot remains the same and no midi message is output. { MIDImessage(176,1,val);} // 176 = CC command (channel 1 control change), 1 = Which Control, val = value read from Potentionmeter 1 NOTE THIS SAYS VAL not VA1 (lowercase of course) lastVal = val; val2 = analogRead(1)/8; // Divide by 8 to get range of 0-127 for midi if (val2 != lastVal2) { MIDImessage(176,2,val2);} // 176 = CC command, 2 = Which Control, val = value read from Potentionmeter 2 lastVal2 = val2; val3 = analogRead(2)/8; // Divide by 8 to get range of 0-127 for midi if (val3 != lastVal3) { MIDImessage(176,3,val3);} // 176 = CC command, 3 = Which Control, val = value read from Potentionmeter 3 lastVal3 = val3; delay(10); //here we add a short delay to help prevent slight fluctuations, knocks on the pots etc. Adding this helped to prevent my pots from jumpin up or down a value when slightly touched or knocked. } void MIDImessage(byte command, byte data1, byte data2) //pass values out through standard Midi Command { Serial.write(command); Serial.write(data1); Serial.write(data2); }