This function can be used to change the pitch of all sounds emitted from the given emitter. It is a pitch multiplier, in that the input value multiplies the current pitch by that amount, so the default value of 1 is no pitch change, while a value of less than 1 will lower the pitch and greater than 1 will raise the pitch. 最好对此函数使用小增量，因为任何低于0或大于5的值都可能无法听到。NOTE: If a sound is being looped through the emitter, the change in pitch will not be detected unless the sound is stopped and looped again!
|emitter||The index of the emitter to change.|
|音调值||The pitch multiplier (default 1).|
case 1: audio_emitter_pitch(s_emit, 0.8); break;
case 2: audio_emitter_pitch(s_emit, 0.9); break;
case 3: audio_emitter_pitch(s_emit, 0.95); break;
case 4: audio_emitter_pitch(s_emit, 1); break;
case 5: audio_emitter_pitch(s_emit, 1.2); break;
The above code will change the pitch of the audio played from the emitter indexed in the variable "s_emit" based on the value of the variable "gear".