As I recall, the LM324 has no "base spreader resistors" in the
output's complementary emitter follower.  This results in substantial
crossover distortion.  The distortion is reduced when you run a lot of
feedback.  One solution is to change the output from running class B (or
is it closer to class C?) by adding a resistor between the output and one
of the supplies.  This will force one of the output transistors to always
be conducting.

Harold



Harold Hallikainen
harold@hallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm

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