the Cap Touch HAT is just that - hardware, a way to interact physically with the software. You need a software solution behind that to drive it and do whatever you want with it. So it could be as hard or as easy as you wish, but will depend on your skill and whatever is available to fulfil your requirements.
From my point of view, very limited when it comes to audio on the Pi, most of what you want to do is not particularly hard, if you want to keep it self-contained on the Pi - but if you want to integrate a sequencer running on a different machine where the samples are triggered then you will have to find a way to transmit MIDI from one to the other.
I could suggest our very own Drum HAT as a possible part of your jigsaw. Admittedly it has fewer cap touch pads than you require, but we do provide a python library and examples that would allow you to do real-time triggering of samples direct to your speakers.
It can also be combined with the Adafruit Cap Touch HAT, so the 2 would work together well in that context.