No.so what u r trying to say is that i have to:
1) make Vref of my DAC to be 0.15v.
Simply turn down the volume control.
If you want it to work with a full power output of only 0.14W.2) Make Vs of my lm386 = 5v. ( i have already done this)
Not 0.1nF (100pF) because it will pass only ultrasonic frequencies from bats. Instead use 0.1uF to 0.22uF to pass most sounds.3) Insert a capacitor of abt 0.1nF in between the DAC output and the variable resistor
No.4) Change the feedback from the current config to the "-input" of the lm386?
Remove your feedback because the LM386 already has its own negative feedback built-in.