Using different methods, try to combine two or more sounds in such a way that online one sound is perceivable.
Tools to use:
1. the mixer: adjusts the volumes of the sounds so that they merge into one another;
2. the filter; adjusts the “colours” of the sounds to match;
3. the time-speed modulator or the transposer: to match the pitch and/or the speed of the different sounds being combined.