Change your class names
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MySynthesiser.handMySynthVoice/MySynthSoundaren't the most descriptive of titles. -
lfo.hhas a class namedlfoand literally no other class is in lower case, change it.
MySynthesiser.h and MySynthVoice / MySynthSound aren't the most descriptive of titles.
lfo.h has a class named lfo and literally no other class is in lower case, change it.