Have a look at the Max window when you click the [read sampleA2.wav] message, does it say "cannot find…" or something? Max needs to know where your files are stored (you set this in File Preferences). I’m not in front of max right now, but you can preload a sample into buffer on patch startup; open the helpfile for buffer and search in there, my message syntax may be incorrect (‘load’ or ‘read’ i’m not sure)
Make sure your .wav file is in the same folder as your max patch file, don’t put the sound file in another folder of its own. then use the [read sampleA2.wav] object going in to your buffer object and have a loadbang object going in to the [read sampleA2.wav].