The router determines the ES1 parameters (targets) that are modulated by the LFO and by the modulation envelope. The buttons in the left column set the target for LFO modulation. The buttons in the right column set the target for the modulation envelope.
Pitch buttons: Modulate the pitch—the frequency—of the oscillators.
Pulse Width buttons: Modulate the pulse width of the pulse wave.
Mix buttons: Modulate the mix between the primary oscillator and the sub-oscillator.
Cutoff buttons: Modulate the cutoff frequency of the filter.
Resonance buttons: Modulate the resonance of the filter.
Volume buttons: Modulate the main volume.
Filter FM button (mod env only): Use the triangle waveform to modulate filter cutoff frequency. This modulation can result in a pseudo-distortion of the sound, or it can create metallic, FM-style sounds. The latter occurs when the only signal you can hear is the self-oscillation of the resonating filter (see Drive the ES1 filter to self-oscillate).
LFO Amp (mod env only): Modulate the overall amount of LFO modulation.