Hackey-Trackey VS JSFX

Or even this https://github.com/JoepVanlier/Hackey-Trackey if you are not too new to Reaper to get it installed.

There's a tracker plug-in for Reaper. Unfortunately there doesn't seem to be anything similar for any other DAW. https://github.com/JoepVanlier/Hackey-Trackey

SEQS https://github.com/JoepVanlier/JSFX (many of the others are great too).

These free JSFX are worth checking out https://github.com/JoepVanlier/JSFX

Install ReaPack and get access to thousands of new JSFX. Saike's stuff is amazing. Ravager is one of the most unique plugins I've ever used. I can't believe it's free. This guy makes of free, awesome JSFX, too.

Sai'ke's Stereo Bub for Reaper JSFX uses complementary comb filters which cancel out when combined in mono.

I find all the stuff Geraint Luff, Saike and Tukan Studios make are really great and can all be managed using ReaPack.

There is a jsfx granular sampler here https://github.com/JoepVanlier/JSFX named 'Amaranth' will de exactly what you are looking for. In fact coupled up with a few more of the effects from this repository you can get very creative with making vocal ambient drones etc. once your happy with what you have created, use freeze in Amaranth and then render your track, you can then manipulate with like someone else said Rrrreaaaa time stretching, then maybe even add effects directly onto your 'item' and then glue each time you make a change.

Anytime interested should check out saikes Multi band splitter/joiner if you are interested in a tool like this, free and ultra powerful.