Octatrack!!!
Here is what it can do.
-8 tracks to load or record ANY sound including synth and drum sounds on one track.
-process external gear with effects (good use for your Volcas)
-MIDI control on 8 tracks (including your Volcas) any other synth
-extremely powerful sample engine that comes really close to a synth
-effects like bitcrush, filter, delay,reverse, pitch etc…
-add effects to any incoming audio
-turn your Octatrack into a dj mixer (4 inputs and crossfader)
-turn your Octarack into 2 dj players and mixer (load up entire CDs and mix them with effects using tracks and the crossfader)
-turn your OT into a song production station without ever powering up your PC, kicks, pads,bass (as long as you have them sampled)
-turn your OT into a sound recorder, plug your video games, CD player or vinyl player and sample and remix and edit your favorite tracks to draw inspiration without needing a computer.
I only got mine a few months ago and I love it. I also had A4 and AR before. I threw my A4 and AR in the trash, if you want them they are somewhere rotting away…
P.S. The reason I am suggesting OT is because you HAVE other synths to sample and record from, plus you can get samples anywhere these days. I think Volcas are great and Octatrack would ADD to them while AR and A4 will REPLACE them, my philosophy is to keep good stuff and only add to it and replace when the time comes.