I am pondering over trying a couple of small switches in the signal path to switch between a little resistor attenuation and none. Having just tried adding a couple of resistors to get some more range whilst using the headphone this worked well but its knocked back the volume via the speakers more than I would like.
On my next mouser order I will add a few different values to try only having a couple of RN55 270k to hand and finding they where a little to much attenuation.
Also wondering if it is possible to attenuate only the head phone out at the socket somehow? Any thoughts, suggestions welcome?