Loudness vary greatly depending on the tone

[deshipu]

I run the simple_test.py on a Hallowing with an Adafruit 8Ω speaker connected, and I noticed that the loudness of the notes varies greatly depending on the tone — some high-pitched tones sound several times louder than the rest of the melody.

[deshipu]

It looks like there is some kind of overflow or other wraparound effect for the sounds that sound loud:

[kattni]

@deshipu Is this issue still present?