A wearable device includes: a first output transducer configured to provide an audio output for perception by a user; a touch-based interface configured to receive an user input from the user, and to generate an interface output based on the input, wherein the touch-based interface is not directly viewable by the user when the wearable device is worn by the user; a sensor configured to sense a condition related to the user input, and to generate a sensor output; and a processing unit configured to process the interface output based on a first processing scheme if the sensor output indicates a first context of the user input or if the processing unit does not obtain the sensor output, and wherein the processing unit is configured to process the interface output based on a second processing scheme if the sensor output indicates a second context of the user input.