just Casio SK-1 human voice patch (but with 2X delay speed or shifted down an octave?)

AFX - Field Day

Caustic Window - On The Romance Tip

~from "Rephlexions! An Album of Braindance!"

~still from 2010:: "Garagisme | DreamSpace" PDX Time-based art festival, OR.

https://www.discogs.com/release/398345-AFX-Analord-04