Build your pages in the browser

Start from a synth

Every map in the synth library opens in the editor. Move controls between pages, rename them, change their color and their range, then send the preset to Karl.

Draw your own controls

A control can be a fader, a list, an envelope or an XY pad. Envelopes drive four parameters at once; XY pads drive two.

Script what the map cannot say

Some values read better in their own units. A few lines of Lua turn a raw value into hertz, notes or milliseconds:

-- Show the filter cutoff in Hz on the screen
function cutoff.format(value)
  local hz = 20 * (1000 ^ (value / 127))
  return string.format("%.0f Hz", hz)
end

Scripts also listen to incoming MIDI, so a synth can update Karl when you turn its own knobs.