No, not taboo, just not AYP. I have tried binaural beats they are effective in promoting relaxation, but they won't work for AYP meditation, or meditations that are ongoing. In other words the external sound is working the external senses while AYP is about inner sensuality or introversion of the senses.
I used a Holosync CD and then found a free website where you could download the beats and mix them with pleasing white noise such as rain or a river. Very chilled.