Skip to content
de

Prompt Audio · FM synth

Bessel

Six-operator FM synth with a free 8x8 matrix and about 15,400 built-in voices

Bessel has six FM operators, and in its 8x8 matrix any operator can modulate any other, feedback and cycles included. A saturator and noise operator and a dual morphing filter operator join the six. It comes with 42 factory presets and 481 built-in banks of about 15,400 voices, and it imports voices and banks in DX7 SysEx format.

Operators
6
Envelopes
9
Built-in voices
15,400
Effects
12

What it does

  • Any operator modulates any other

    The 8x8 matrix allows feedback and cycles. A menu loads any of 32 six-operator algorithms when you want a known starting point.

  • 32 waveforms per operator

    Set each operator by ratio or fixed frequency, with detune, offset, velocity and keyboard level scaling. All 32 waveforms are band-limited.

  • Envelopes with 32 points

    Nine multi-breakpoint envelopes have curves per segment, sustain loops, tempo sync and key and velocity scaling.

  • A filter inside the FM structure

    The dual multimode filter operator morphs from low-pass through band-pass to high-pass, in serial or parallel. A saturator and noise operator adds drive and noise.

  • Imports DX7 SysEx

    Load 32-voice bulk dumps or single voices. Bessel converts the algorithms, envelopes, scaling, LFO and pitch envelope.

  • Arpeggiator, morph square, 12 effects

    The 32-step arpeggiator has per-step tie and accent, shuffle and host sync. An XY square blends four corner sounds, and the 12 effects include a tube amp, a cabinet and a talk wah.

Good to know

  • Only the 42 factory presets were made for Bessel. The 481 built-in banks come from a public patch archive.

System requirements

  • macOS 11 or later
  • Apple silicon or Intel Mac
  • Formats: AU, VST3, Standalone
  • A host that loads Audio Units or VST3 plug-ins, for the plug-in versions

More from the same line

Cookies

This site needs no cookies to work. With your consent it loads Google Analytics to count visits.

Privacy policy