You probably can't undo an edit once the file has been saved.

If you added an effect, that effect should be listed in the Fx windows, but you need to tell us more: How did you add the effect? What is the effect? As much info as possible helps give accurate responses.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
2016-02-22_22-29-06.jpg (152.99 KB, 61 downloads)

BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.