If you want total control, create your own using (free software).
Considered the gold standard for audio play, featuring a dedicated stereo audio-in port and excellent frequency response.
Start with a base frequency around 600Hz with modulations to understand how different patterns feel. Many creators explore waveforms including sinus patterns for gentle stimulation, square waves for more intense sensations, variable pacing from slow stroking to faster rhythms, and modulation patterns that create edging and build-up effects.