A method, comprising: at a computer system in communication with a touch-sensitive surface, wherein the touch-sensitive surface includes a first portion that is associated with a first operation and a second portion that is associated with a second operation, different from the first operation, wherein the first operation and the second operation are associated with audio: detecting, via the touch-sensitive surface, a first input, wherein detecting the first input includes detecting first contact having a respective size; and in response to detecting the first input: in accordance with a determination that the respective size of the first contact is less than a first threshold size and that the first input is directed to the first portion of the touch-sensitive surface, initiating a process for performing the first operation; in accordance with a determination that the respective size of the first contact is less than the first threshold size and that the first input is directed to the second portion of the touch-sensitive surface, initiating a process for performing the second operation; and in accordance with a determination that the respective size of the first contact is greater than the first threshold size, initiating a process for performing the first operation without regard for whether the first input is directed to the first portion or the second portion of the touch-sensitive surface. detecting, via the touch-sensitive surface, a first input, wherein detecting the first input includes detecting first contact having a respective size; and in response to detecting the first input: in accordance with a determination that the respective size of the first contact is less than a first threshold size and that the first input is directed to the first portion of the touch-sensitive surface, initiating a process for performing the first operation; in accordance with a determination that the respective size of the first contact is less than the first threshold size and that the first input is directed to the second portion of the touch-sensitive surface, initiating a process for performing the second operation; and in accordance with a determination that the respective size of the first contact is greater than the first threshold size, initiating a process for performing the first operation without regard for whether the first input is directed to the first portion or the second portion of the touch-sensitive surface. in accordance with a determination that the respective size of the first contact is less than a first threshold size and that the first input is directed to the first portion of the touch-sensitive surface, initiating a process for performing the first operation; in accordance with a determination that the respective size of the first contact is less than the first threshold size and that the first input is directed to the second portion of the touch-sensitive surface, initiating a process for performing the second operation; and in accordance with a determination that the respective size of the first contact is greater than the first threshold size, initiating a process for performing the first operation without regard for whether the first input is directed to the first portion or the second portion of the touch-sensitive surface.