Hello, I am a beginner of Pd. When I try the patch shown on pd_intro.pdf, it seems not working as I copy exactly the structure of the table oscillator. Could somebody tell me how to fix it? B array seems dead.

@Leorange Hello...... and welcome to the Forum!

Maybe you do not have audio turned on.
When an object has a "tilde" (~) at the end of its name it is an audio object, and it will not work if the audio processing is turned off in Pd.
Click the "media" tab at the top of the patch window, and then "DSP On".
David.

@whale-av The table oscillator works, thank you very much!