Well, it does know most of the basic tricks you’d expect from a wavetable synth, with emphasis on basic. But indeed; the only “new” thing it does, AFAICT, is just a shortcut for the most simple case of the ancient “sample your synths” approach to sound design. Any wavetable that lets you import custom wavetables can do this, though you may need to use more steps or external tools.
Most synths these days have decent visualization and will respond all or mostly in realtime to parameter edits. You can even smoothly automate literally any parameter from the host in some cases, without going via macro controls or similar.
Here are a few that will respond in realtime, have control and filter curve visualizations, and that will visualize waveforms on some level:
- Carbon Electra (output oscilloscope)
- Waves CODEX (3D wavetable visualization)
- Europa by Reason (oscillator waveform visualization)
- Waves Flow Motion (osc waveform “icons” + output oscilloscope)
- Helm (osc waveforms + output oscilloscope)
- kHs Phase Plant (oscillator waveforms, including sync, unison etc)
- Serum (3D wavetable visualization )
- VPS Avenger (osc waveforms)
- 2nd Sense Audio Wiggle (spline waveform editors)
I’d say Helm might be among the better for figuring out the basic waveforms, and also FM/PM, but it doesn’t seem to support custom waveforms.
Serum has a proper wavetable editor where you can also analyze and edit in the frequency domain.
VPS Avenger visualizes the effects of bandpass filtering, formant filtering, bitcrushing, and various other effects/transforms, and has a nice wave/sample browser with preview.