LFO

Katla’s five per-voice LFOs share a single rate knob and can be offset using the key-tracking knob. The LFO includes a rate-switch button toggling between slow and fast ranges. When the key-tracking knob is centered, the LFO rate is tuned to C at both its slowest and fastest settings.

• Slow range: 0.064 Hz (C-8) to 4.8 Hz (C-2)
• Fast range: 1.02 Hz (C-4) to 65.4 Hz (C2)

Total modulation span: 10 octaves.

Tip

Try setting the LFO rate to its maximum value while in the Fast range, then turn the key-tracking knob fully clockwise. This enables audio-rate modulation that tracks the pitch of each note.

Waveshapes

• Sine
• Sawtooth
• Reverse sawtooth
• Square
• Volcano — a slewed sample-and-hold that generates two random values per cycle

LFO Destinations

Phase Distortion

Works the same way as the Mod Envelope’s Phase Distortion. Pushing the slider upward introduces phase distortion, while pushing it downward inverts its direction.

Filter Cutoff

Pushing the slider upward increases the filter cutoff frequency, while pushing it downward reduces it.

Reverb Mix

Pushing the slider upward increases the reverb mix, while pushing it downward reduces it.

This is where LFO min-maxing comes in. Because five LFOs share control of a single stereo parameter, and because their rates can differ dramatically, Katla calculates their combined outputs and uses that to drive the modulation. The result is a uniquely complex, non-repetitive movement.

• Slider up: uses the combined maximum outputs of the five LFOs
• Slider down: uses their combined minimum outputs

LFO min-maxing also applies to: Drive Mix, Effects Amount, and Effects Color.

Drive Mix

Pushing the slider upward increases the drive mix, while pushing it downward reduces it. Uses LFO min-maxing.

Effects Amount

Pushing the slider upward increases the reverb and drive amounts, while pushing it downward reduces them. Uses LFO min-maxing.

Effects Color

Pushing the slider upward brightens the reverb and drive signals, while pushing it downward darkens them. Uses LFO min-maxing.

Rökkur

Applies stereo movement to each voice independently.

Rústir

Katla’s wavefolder. Pushing the slider upward increases wavefolding, while pushing it downward reduces it. This control signal is also wavefolded when pushed beyond its limits, causing its direction to invert.