Fader/Attenuator/Attenuverter/Crossfader

The Instruō [1]f is a crossfader, attenuator, attenuverter, and manual
DC offset.

Whether you want to crossfade between two audio signals, attenuate
an envelope, invert a sawtooth LFO for ramped modulation, or use
a DC offset to access the Mod parameters of your arbhar, [1]f is the
perfect multi-utility for all of your CV processing tasks

• Crossfader
• Attenuator & Attenuverter
• Unipolar positive or unipolar negative DC offset
• DC coupled for both audio and control voltage processing
• Bicolour LED indication of output voltage

https://www.instruomodular.com/product/1f/