Well it's 8 bit, so it's gonna sound ruff. You can get decent quality tho, certain sounds are effected by the 8 bit more than others, the volume output is low, but if you record too hot, it will distort even more.
Try turning the volume of the samples down, it will distort a lot less. Also, like I stated above, when sampling be careful not to clip.
Below are 2 beats I made on it, best quality I was able to get, I had to use a mixer to boost the level without distorting too much & I also eq'd.....didn't master either tho. Just play with it, but you can't get around the fact that it's 8 bit. If you don't like dirty beats, it might not be for you.
https://sharris.bandcamp.com/track/k-o-beat
https://sharris.bandcamp.com/track/haha
Not tryin to push my beats, they're just K.O. beats, but a good example of sound quality & what you can get out of it.
Oh & when linking sequences & playin in live, you have to careful, if you're hitting the sample just a little late or a little too soon it'll enter the hit in the sequence next to it...... hopefully that makes sense.
Any other questions just ask

I love the K.O., but I love limited gear.....only thing I don't like about it is the low volume (which can make you want to turn it up, which distorts the audio