Octa

A polyphonic octaver with fast, responsive tracking, low latency, and minimal DSP
usage.
Octa generates up to three independent octave voices: two above and one below
the original signal. It tracks even the most complex playing, whether it’s single
notes or chords. The low-pass filter lets you shape the octave voices to fit your
mix.
Combine it with other effects anywhere in your signal chain to create a wide range
of sounds. Designed for bass and guitar, it works equally well with other
instruments and audio sources.
Controls

Filter: 700 Hz to 11 kHz -1
oct: -inf to +6 dB
Clean: -inf to +6 dB +1
oct: -inf to +6dB +2
oct: -inf to +6 dB