Your 25k resistor needs to connect to out, not to the transistor bases. You have a controlled op-amp feeding an open loop transistor pair. The transistors need to be part of the loop.
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Yes, they act like separate blocks, but the transistors alone *aren't* a linear amplifier. They will heavily distort the audio without the opamp. And since they need the opamp they're no longer a separate block.
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As for the pot, what I'm saying is it *won't* control the volume properly if you don't ground the third terminal.
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