How to let the user choose sections of two different WAV files and join these two sections togerther?

Hi I am new to MATLAB and what I can do till now is play two wav files independently. But the requirement ask me to make the users choose section from each file and play independently.And what's more,combine these two sections together and play. I uses these code to choose section,but I can do nothing but play it.Can anyone tell me if there exists better solutions?

[s,fs]=audioread('hootie.wav');
handles.s=s;
handles.fs=fs;
handles.myPlayer=audioplayer(s,fs);

play(handles.myPlayer);
guidata(hObject,handles);

plot(handles.axes2,s);
[x1,y1]=ginput(1) %select the start point
[x2,y2]=ginput(1) %select the end point
soundsc(s(x1:x2),fs); %listen to the wav from start point to end point

[Walter Roberson]

Are the two files definitely the same sampling frequency?