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It's not a class D is it?
It's a TDA7498, which is a class-D amp.His issue is that he can't reference the LM3915 ground to the amp's ground, that way it would have been a lot easier.
although still haven't gotten it confirmed in my head if I put diodes between V- of both lm3915 ic's so that they cant backfeed through each other.
If I drive both channels it seems like the leds only show up when there is a difference between the channels. If I use a signal generator on both channels with the same frequency and magnitude no leds light up at all on either channel.