Bolt

Bolt by Nektar Technology is a harmonics synthesizer that builds tone directly inside its oscillators rather than relying on a traditional filter section. Turn the Harmonics and Rolloff controls to move from gentle sine-like sounds to bright, overtone-heavy pulse textures, with Odd and Deep options offering further waveform shaping. Each oscillator has its own amplitude envelope, giving you direct control over how notes develop. For movement, three LFOs and an ADSR-style modulation envelope let you animate multiple parameters, with pre-assigned targets making experimentation straightforward. More than 500 factory and artist patches provide starting points for lush pads, deep basses, cutting leads and effects. With its streamlined interface and rich, organic character, Bolt suits hobby producers who want to explore synthesis without getting buried in complex programming. It supports VST and AU-compatible DAWs.