The best way to use an oscilloscope for audio debugging is to first set up the scope and probe, then adjust the vertical and horizontal scale knobs so that you can see the waveform generated by your signal. Once you have done this, you can start making adjustments to your sound source to improve its performance. You should be able to observe any changes in real time on the scope's display and make further adjustments if needed. Additionally, you can also measure frequency response or find out what kind of noise is present in a signal. Ultimately, using an oscilloscope for audio debugging will help you determine how your sound source is performing and identify any issues or problems that need to be addressed.