Artifacts mean that you are (perhaps unknowingly) crowding your mix with unwanted tones / frequencies.
Without considerable care and a whole lot of number crunching, this process will create audible artifacts. Playback of wavetables requires digital resampling to play different frequencies. You can import single-cycle wavetables of course, as well as many at once (with in-built sorting options, or manual re-ordering). Import audio directly from audio files – Serum has a variety of methods and options for analyzing audio for breaking it apart into individual waveforms. Serum has a Wavetable editor built right in- you can create your own wavetables in a variety of ways. WHY SERUM? The dream synthesizer did not seem to exist: a wavetable synthesizer with a truly high-quality sound, visual and creative workflow-oriented interface to make creating and altering sounds fun instead of tedious, and the ability to “go deep” when desired – to create / import / edit / morph wavetables, and manipulate these on playback in real-time. Description of Xfer Serum & Serum FX 1.28b6