A vactrol phaser with 4/8 stages.
The PHASER module runs the signal through a chain of all pass filters, which brings a very distinctive sound when the filter stages are modulated. Well known is this sound by many pieces of electronic music in the 70's and 80's; especially with the SOLINA as audio source you get this unique spacey sound known from these days. With a switch you can select 4 or 8 stages; more stages make the modulation more deep and intense.
The module has a low-frequency LFO onboard, an external modulation CV can be used also as modulation source.
You can find more information about this module on the AE Modular Wiki.
(Price without VAT; for buyers inside the EU 19% VAT will be added to the shown price = 61,88€)