Hello Andre, If you are interested in source code, here is a multi-wavetable implementation of a band-limited sawtooth oscillator. It windows the partials to avoid the Gibbs Effect.
https://github.com/philburk/jsyn/blob/master/src/com/jsyn/unitgen/SawtoothOscillatorBL.java You can combine two sawteeth waveforms to get square or rectangular waveforms. https://github.com/philburk/jsyn/blob/master/src/com/jsyn/unitgen/SquareOscillatorBL.java Another technique is the Differentiated Parabolic Waveform, DPW. It is much easier but sounds almost as good as the above. https://github.com/philburk/jsyn/blob/master/src/com/jsyn/unitgen/SawtoothOscillatorDPW.java Phil Burk
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