LinPlug MorphoX - Manual (Page 16)

Filter / Filter Env
The LinPlug MorphoX contains a special, newly designed filter, which
produces a unique, characteristic sound you won't find in any other
instrument. It supports morphing and offers three simultaneous outputs: low
pass, band pass and high pass.
The FM parameter determines how much the filters cutoff frequency is
modulated by Oscillator 1. Note, that even if Oscillator 1 is turned fully
silent in the Oscillator Mixer, it can be used to modulate the filter cutoff
frequency.
Cutoff is used to set the frequency at which frequencies are filtered out of
the signal. When using the Low Pass output, higher settings produce
brighter sounds while lower settings result in darker sounds. When using
the High Pass output higher settings produce thinner, brighter sounds,
while lower settings produce fatter, darker sounds.
When using the bandpass output, only the frequency spectrum around the
cutoff frequency is passing the filter.
Track (tracking) is used to control the degree to which the filter tracks the
note being played. So higher notes have a higher cutoff frequency, while
MorphoX user manual 1.1.0 page 16