I've got problem with sound on sequences in my mpc1000

Hello. Some day ago i bought mpc and i cannot find this in the instruction. The problem looks that When I put some sounds on pads and im hitting on the same time mpc plays only one sound. And when i record it for exampel snare with hihat it doesn't play hihat. How to turn of this option because I'm not able to do anything with it

change your program from mono to poly in the upper right of the program editor screen

also, the reason it did this is probably because you first recorded a sample, made a new program, and then put drums in that program. when you chop a sample it will automatically put it to mono (at least on JJ OS, i've never used Akai OS)