Thru Zero Oscillator
From IG(more info soon):
The tune switch changes the knob response from fine to coarse - or drops the core into LFO mode, which is also a coarse response. Frequency range is from a few minutes to about 28kHz.
https://www.youtube.com/watch?v=3iF5KggV1s4
https://steadystatefate.com/products/zephyr
This Module is currently available.
$379