Can't Undo Changes To Waveforms

Whenever I want to undo a change I’ve made to a waveform, it only undoes the previous action but never what I’ve done to a waveform.

This just started happening and I never experienced this problem previously.

Thanks.

you need to tick the undo checkbox in the left of the screen of the sample editor.

Wow duh :/… Thanks!!

Since I have you here do you think you could tell me how to make the instruments follow along when I tab over to other columns?

thanks in advance