User Guide

20.3. OPERATOR 301
Pitch Env control.
Tip: If the pitch envelope is only applied to the LFO and is looping, it can serve as another
LFO, modulating the rate of the rst. And, since the envelope of the LFO itself can loop, it
can serve as a third LFO modulating the intensity of the rst!
20.3.5 Filter Section
Operator's Filter Section.
As mentioned earlier, the lters are not the main focus of this instrument. However, they
can be very useful for modifying the sonically rich timbres created by the oscillators. And,
since the oscillators also provide you with the classic waveforms of analog synthesizers, you
can very easily build a subtractive synthesizer with them.
The lter section offers 12 dB low-pass, band-pass, high-pass and notch lters. Note that
the notch lter is not of true notch lter design but a bell-shaped curve with very low gain,
which removes more of the frequencies around the center.
Filter cutoff frequency and resonance can be adjusted in the shell. Filter frequency can also
be modulated by note velocity, note pitch, the LFO and the lter envelope. The Freq<Vel,
Freq<Key and Envelope controls in the lter's display set these three functions, respectively.