Recording Experimental Signals > Creating Stimulus Protocols > Analog & Digital Output Channels
Analog Outputs (AO): Select the number of analog output channels to be used in the analog outputs No. Channels list.
For each AO channel defined, select the type of stimulus (Voltage or Current) and the stimulus units in the Stimulus Type list and the holding level (the level relative to which voltage/current steps are applied) in the Holding Level box.
Digital Outputs (DO): Select the number of digital output channels to be used in the digital outputs No. Channels list.
Set the holding pattern (the default digital output state between digital stimulus pulses) in the Holding Pattern check boxes.
(Note, during execution of a stimulus protocol, the analog and digital holding levels override the default holding levels set in the Seal Test or Default Settings windows).