Fomp is an LV2 port of the MCP, VCO, FIL, and WAH plugins by Fons Adriaensen.

There are 13 plugins in total: 1 auto-wah, 1 EQ, 3 chorus, 5 filters, and 3 oscillators.

The plugin implementations are identical to their LADSPA forebears, except the primary frequency port of oscillators and filters has been converted to Hz to facilitate use in any host without assuming the hidden tuning frequency of AlsaModularSynth. All other frequency ports remain as they were, using octaves for faithful Moog-like modulation.

Aside from that, the main benefit of these LV2 ports is improved metadata: CV ports are distinguishable from audio ports, controls have units where applicable, documentation is built-in for display in host UIs, and so on.

The oscillators and filters are mainly useful in modular synthesizers, but since CV ports are distinct from audio ports, they should work fine in non-modular hosts as well.


The latest version of Fomp is 1.0.0, released on October 27, 2012.


The latest development version of Fomp is available from git: git clone

Other development resources (including issue tracker, update timeline / feed, wiki, and source code browser) can be found at

Bugs / Feature Requests

Please report any issues here