The output from the Music Module is a DC offset and I could not get any sound out of a DFRobot Audio board.
At first I thought the audio module had no output signal but when I checked with the scope I saw that without anything playing the output was a noise DC signal or approx 2V
with the sine test running I can see that the audio signal is super imposed on this.
The audio module was seeing the signal at the input to the LM386 but there was only a zero signal on the output. Checking the output from the LM386 it had a DC offset.
After I fitted a capacitor between the Music Module output and the audio input I was not getting sound from the system.
For anyone else experiencing this issue, was out for this if you audio amp has no capacitor on the input to remove the DC component.
PS… The output from this music module is very noisy when nothing is playing. You can see this on the scope. I now need to consider adding a relay to the output to switch it off when not playing any sounds otherwise it is going to drive people nuts!