Synthesis approaches using multiple wavetables are also common.
For example, if one wants to vary the evolution of a tone over time, multiple tables can be used that are mixed into the result over time. In this case, no more than two tables are used at any given time and the mix is controlled by envelopes as shown in Fig. 4.
Another multiple table approach involves the use of many simultaneous tables with mixing strategies that depend on fundamental frequency, amplitude, or other factors as diagrammed in Fig. 5.