Hi Josh,
I am trying to "teleport" the position of a wheel at the beginning of a new state by setting a new position using the output action {'RotaryEncoder1' ['P' 2-bytearray]} with no luck. Here is my code.

%% startingPositionsWheelInDegree = [-90 90]; startingPositionsWheelInTics = round(startingPositionsWheelInDegree*1024/360); startingPositionsWheelInTics_TwoBytesArray = []; for idxPos = 1:length(startingPositionsWheelInTics) int16Number = int16(startingPositionsWheelInTics(idxPos)); byteArray = typecast(int16Number, 'uint8'); byteArray = fliplr(byteArray); startingPositionsWheelInTics_TwoBytesArray = [startingPositionsWheelInTics_TwoBytesArray; byteArray]; end newPosition1 = {'RotaryEncoder1', ['P' char(startingPositionsWheelInTics_TwoBytesArray( 1, : ))]}; newPosition2 = {'RotaryEncoder1', ['P' char(startingPositionsWheelInTics_TwoBytesArray( 2, : ))]}; BpodSystem.Data.StartingPositionsWheelInDegree = []; R = RotaryEncoderModule('/dev/cu.usbmodem35800201'); R.wrapPoint = 360 * 32; R.startUSBStream; for currentTrial = 1:2 S = BpodParameterGUI('sync', S); sma = NewStateMachine(); sma = AddState(sma, 'Name', 'State1', ... 'Timer', 2,... 'StateChangeConditions', {'Tup', 'State2'},... 'OutputActions', newPosition1); sma = AddState(sma, 'Name', 'State2', ... 'Timer', 2,... 'StateChangeConditions', {'Tup', 'State3'},... 'OutputActions', newPosition2); sma = AddState(sma, 'Name', 'State3', ... 'Timer', 2,... 'StateChangeConditions', {'Tup', '>exit'},... 'OutputActions', {'RotaryEncoder1' 'Z'}); SendStateMachine(sma); RawEvents = RunStateMachine; if ~isempty(fieldnames(RawEvents)) BpodSystem.Data = AddTrialEvents(BpodSystem.Data,RawEvents); BpodSystem.Data.TrialSettings(currentTrial) = S; BpodSystem.Data.EncoderData{currentTrial} = R.readUSBStream(); BpodSystem.Data.StartingPositionsWheelInDegree(currentTrial) = startingPositionsWheelInDegree(currentTrial); SaveBpodSessionData; end HandlePauseCondition; if BpodSystem.Status.BeingUsed == 0 R.stopUSBStream; return end end R.stopUSBStream; %%

I also tried 'OutputActions,' {'RotaryEncoder1', ['P' 'x' '1']} at the end of State1 and State2; however, plotting the recorded Encoder.Data revealed that the position had not been changed at the beginning of the two states. Can you please help me?