The bias current is supposed to be sourced from 0V; the IC internal bias current circuit operates at about two diode drops from negative supply.
The weird Q2 configuration is a logarithmic converter, common (in some form) in synths.
Double check all the resistor values??
The Q2 and OTA bias input circuits are current control, not voltage, so there should not be much voltage change at the amp control input pin over the control input range.
If it reaches even 1.5V above the negative supply, the IC may already have been damaged, or be faulty.
See the amp bias input circuit, bottom left in the diagram; two base-emitter junctions connect it to negative power. Anything more than 2mA in to that pin can damage or destroy it.
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